Chemically Specified Frit Compositions Patents (Class 501/21)
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Patent number: 5939343Abstract: This invention provides a new lead-free glass composition, a glass frit of this composition, a process for its production and also coloring preparations containing such a glass frit and the use thereof. The glass composition according to the invention contains in mol-%K.sub.2 O 10-17B.sub.2 O.sub.3 10-25TiO.sub.2 15-30SiO.sub.2 35-55Al.sub.2 O.sub.3 0-5Bi.sub.2 O.sub.3 0-5S 0-3 and any oxide from the group consisting of PbO, CdO, ZnO, Li.sub.2 O, Na.sub.2 O, MgO, CaO, SrO, BaO and P.sub.2 O.sub.3 which is present being present in a quality of less than 0.5 wt-% in each case. Glass frits of this composition are very suitable for use in coloring preparations for the production of glass enamels, in particular for panes of glass for automobiles. Glass frits according to the invention can be stoved at low temperatures, exhibit good anti-sticking properties, a high resistance to acids and a diminished migration of silver.Type: GrantFiled: March 6, 1997Date of Patent: August 17, 1999Assignee: Cerdec Aktiengesellschaft Keramische FarbenInventors: Gerhard Tunker, Hildegard Paulus
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Patent number: 5935887Abstract: A ceramic filter for filtering molten metals includes aggregate particles consisting of fused alumina and/or sintered alumina, and a binder material, wherein the binder is present in an amount of 10 to 22 parts, by weight, per 100 parts of the aggregate particles. The binder material consists of 15 to 25%, by weight, of Al.sub.2 O.sub.3, 35 to 52% of B.sub.2 O.sub.3, not less than 7% and less than 15% of Sio.sub.2, and the balance of MgO. The ceramic filter may be prepared by kneading 100 parts of aggregate particles consisting essentially of either or both of fused alumina and sintered alumina, 10 to 22 parts of the foregoing binder material, an appropriate amount of an organic binder and an appropriate amount of water; molding the resulting mixture; drying the molded mixture; and then firing the same at a temperature ranging from 1150 to 1300.degree. C.Type: GrantFiled: March 30, 1998Date of Patent: August 10, 1999Assignee: Mitsui Mining and Smelting Co., Ltd.Inventors: Eiichi Sudo, Nobuhiro Okuzono
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Patent number: 5922627Abstract: Glass frits containing lithium are used in thick film palladium-silver compositions which after firing result in conductors or resistors that exhibit very low resistivity and TCR.Type: GrantFiled: October 17, 1997Date of Patent: July 13, 1999Assignee: National Starch and Chemical Investment Holding CorporationInventors: David J. Nabatian, Orville W. Brown, James E. Durant
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Patent number: 5856015Abstract: A glaze composition for refractory materials includes 30 to 80% by weight of at least one lead-free and barium-free borosilicate, borophosphate or phosphate glass frit having a dilatometric softening point of below 600.degree. C.; 2 to 30% by weight of aluminium powder or an aluminium alloy powder; 2 to 30% by weight of silicon powder or silicon alloy powder, up to 10% by weight of an inhibitor; and optionally a refractory filler, a clay or other additives. The glaze composition is of particular use as a glaze for carbon containing refractory materials such as submerged entry nozzles and graphite electrodes.Type: GrantFiled: August 23, 1996Date of Patent: January 5, 1999Assignee: Cookson Matthey Ceramics & Materials LimitedInventor: Fraser James Buchanan
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Patent number: 5849649Abstract: A glass flux composition consisting essentially in mol percent of 3.0-13.0 lithium oxide, 0.5-3.5 potassium oxide, 2.5-7.0 sodium oxide, 0.5-2.5 zinc oxide, 2.0-8.0 aluminium oxide, 15-30 boron oxide, 44-68 silica, 1.0-7.0 zirconium oxide, 0-4.0 calcium oxide, 0-3.0 lanthanum oxide, 0-1.0 other rare earth metal oxide, 0-1.0 yttrium oxide, 0-4.0 magnesium oxide, 0-4.0 strontium oxide, 0-4.0 titanium oxide, 0-10 phosphorus pentoxide, 0-1.5 lead oxide and 0-13.0 fluoride is useful for preparing an enamel or cover flux composition, especially for application to ceramic ware.Type: GrantFiled: April 14, 1997Date of Patent: December 15, 1998Assignee: Johnson Matthey Public Limited CompanyInventor: Sucharitra D. Poole
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Patent number: 5827789Abstract: The invention provides a new lead-free glass composition, a glass frit of this composition, a process for its production and also coloring preparations containing such a glass frit and the use thereof. The glass composition according to the invention contains in mol-%______________________________________ K.sub.2 O 10-17 B.sub.2 O.sub.3 10-25 TiO.sub.2 15-30 SiO.sub.2 35-55 Al.sub.2 O.sub.3 0-5 Bi.sub.2 O.sub.3 0-5 S 0-3 ______________________________________and any oxide from the group consisting of PbO, CdO, ZnO, Li.sub.2 O, Na.sub.2 O, MgO, CaO, SrO, BaO and P.sub.2 O.sub.3 which is present being present in a quantity of less than 0.5 wt-% in each case. Glass frits of this composition are very suitable for use in coloring preparations for the production of glass enamels, in particular for panes of glass for automobiles. Glass frits according to the invention can be stoved at low temperatures, exhibit good anti-sticking properties, a high resistance to acids and a diminished migration of silver.Type: GrantFiled: August 29, 1997Date of Patent: October 27, 1998Assignee: Cerdec Aktiengesellschaft Keramische FarbenInventors: Gerhard Tunker, Hildegard Paulus
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Patent number: 5792716Abstract: The present invention provides a new and improved thick film paste for use as an acid resistant overglaze. In one preferred embodiment such paste includes a glass composition comprising in weight percent from about 30% to about 60% PbO, from about 5% to about 20% ZnO, from about 2% to about 20% B.sub.2 O.sub.3, from about 4% to about 12% Al.sub.2 O.sub.3, from about 5% to about 18% SiO.sub.2, up to about 8% ZrO.sub.2, up to about 8% TiO.sub.2 and from about 9% to about 21% Nb.sub.2 O.sub.5.Type: GrantFiled: February 19, 1997Date of Patent: August 11, 1998Assignee: Ferro CorporationInventors: Subramanian Vasudevan, Srinivasan Sridharan, Gordon J. Roberts
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Patent number: 5786288Abstract: A crystallizable ceramic composition for forming a ceramic dielectric body having a dielectric constant in the range of 4.8-5.3 at 1 MHz and a linear thermal expansion coefficient of 4.0-5.1.times.10.sup.-6 K.sup.-1 in the temperature range of 25.degree.-200.degree. C. The dielectric composition comprises a mixture of finely divided particles of 10-90 wt % Mg-Al-Si glass and 10-90 wt % Ca-Al-B-Si glass. The dielectric composition can be used with organic solvents, polymeric binder and plasticizer to produce an unfired green tape which is cofirable with high electrical conductivity metallurgies such as gold, silver, silver-palladium and copper.Type: GrantFiled: December 4, 1996Date of Patent: July 28, 1998Assignee: National Science CouncilInventor: Jau-Ho Jean
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Patent number: 5766741Abstract: An insulating paste comprises a glass component composed of SiO.sub.2, B.sub.2 O.sub.3 and K.sub.2 O as xSiO.sub.2 --yB.sub.2 O.sub.3 --zK.sub.2 O, where x, y and z (% by weight) fall within the area surrounded by points A (x=65, y=35, z=0), B (x=65, y=20, z=15), C (x=85, y=0, z=15) and D (x=85, y=15, z=0), and an organic vehicle. The insulating layer made of the paste has a low dielectric constant and excellent insulating properties.Type: GrantFiled: April 4, 1996Date of Patent: June 16, 1998Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiromichi Kawakami, Hiroji Tani
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Patent number: 5725919Abstract: This invention relates to a lead-free glass enamel for glass beverage containers and a method of decorating glass beverage containers using such glass enamel. The method includes the steps of:i) providing a glass beverage container;ii) providing a decorative lead-free glass enamel comprising a glass frit, the glass frit comprising in weight percent from 17% to 28% SiO.sub.2, from 12% to 30% B.sub.2 O.sub.3, up to 3% Al.sub.2 O.sub.3, up to 13% Na.sub.2 O, up to 13% K.sub.2 O, up to 14% TiO.sub.2, from 5% to 30% ZnO, up to 14% ZrO.sub.2, up to 6% CeO, up to 6% Y.sub.2 O.sub.3, from 1% to 8% La.sub.2 O.sub.3, up to 1% MgO, up to 5% CaO, up to 10% SrO, up to 16% BaO, from 0.5% to 5% fluoride, a maximum of 5% each of WO.sub.3, P.sub.2 O.sub.5, Bi.sub.2 O.sub.3, Sb.sub.2 O.sub.3 and MoO.sub.3, with the provisions that the sum of the levels of plus Na.sub.2 O plus K.sub.Type: GrantFiled: March 13, 1995Date of Patent: March 10, 1998Assignee: Ferro CorporationInventors: Gordon J. Roberts, John J. Maloney, Sivasubraman K. Muralidhar
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Patent number: 5714420Abstract: A ceramic enamel composition consists of an oxide frit, a bismuth silicate seed material, a pigment, and a vehicle. A preferred bismuth silicate seed material is selected from crystalline Bi.sub.12 SiO.sub.20, Bi.sub.4 (SiO.sub.4).sub.3, and Bi.sub.2 SiO.sub.5, and mixtures thereof. Upon firing a glass substrate coated with the enamel, components of the enamel adhere to the substrate. The glass can be formed with a die to a desired shape with reduced sticking of the coated region to the die. The ceramic enamel is particularly useful in providing a colored border around automotive glass, which enhances appearance and reduces degradation of adhesives by ultraviolet radiation.Type: GrantFiled: December 8, 1995Date of Patent: February 3, 1998Assignee: Cerdec Corporation - Drakenfeld ProductsInventors: George E. Sakoske, Joseph W. Ryan
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Patent number: 5710082Abstract: Disclosed herein is a glass composition having a dielectric constant for high-frequency circuits which comprises SiO.sub.2 and at least one of B.sub.2 O.sub.3 or K.sub.2 O in a ratio falling within the region enclosed by lines passing through point A (65, 35, 0), point B (65, 20, 15), point C (85, 0, 15), and point D (85, 15, 0) in a composition diagram for the ternary system of SiO.sub.2, B.sub.2 O.sub.3 and K.sub.2 O. The glass composition may have incorporated with a small amount of clarifying so as to lower the melting temperature and glass softening point. As an insulating material, it is particularly suitable for high-frequency circuits in compact and fast electronic machines and equipment.Type: GrantFiled: September 20, 1996Date of Patent: January 20, 1998Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiromichi Kawakami, Hiroji Tani
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Patent number: 5710081Abstract: Using conventional glass frits for the production of black glass coating compositions makes it necessary also to use a relatively large quantity of black pigments. The quantity of pigment used may be reduced by using black glass frits according to the invention, thin layers of which already have a low transmission.The glass frit according to the invention is black and contains in the glass composition (in mol. %): 10-17% of K.sub.2 O, 10-25% of B.sub.2 O.sub.3, 15-30% of TiO.sub.2, 30 to 55% of SiO.sub.2, 0-5% of Al.sub.2 O.sub.3, 0-5% of Bi.sub.2 O.sub.3, 0.05-3% of Fe.sub.2 O.sub.3 (total iron) and 0.1-3% of sulphur (total sulphur).Type: GrantFiled: February 12, 1997Date of Patent: January 20, 1998Assignee: Cerdec Aktiengesellschaft Keramische FarbenInventor: Gerhard Tunker
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Patent number: 5702996Abstract: Disclosed herein is a glass composition for insulation which comprises SiO.sub.2 and at least one of B.sub.2 O.sub.3 or K.sub.2 O in a ratio falling within the region enclosed by lines passing through point A (65, 35, 0), point B (65, 20, 15), point C (85, 0, 15) and point D (85, 15, 0) on a composition diagram for the ternary system of SiO.sub.2, B.sub.2 O.sub.3 and K.sub.2 O. The glass composition can additionally contain at least one member selected from the group consisting of Al.sub.2 O.sub.3, La.sub.2 O.sub.3, CaO, Ta.sub.2 O.sub.5 and Nd.sub.2 O.sub.3 in an amount less than 25 parts by weight for 100 parts by weight of the major constituents.Type: GrantFiled: September 27, 1996Date of Patent: December 30, 1997Assignee: Murata Mfg. Co., Ltd.Inventors: Hiromichi Kawakami, Hiroji Tani
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Patent number: 5691254Abstract: In order to provide an enamel frit composition for a low-expansion crystallized glass, capable of producing an enamel coating excellent in abrasion resistance and acid resistance without occurrence of cracks by using glass powder which does not contain any harmful component such as PbO, and to provide an enamel-coated low-expansion crystallized glass plate using the enamel frit composition, the enamel frit composition for a low-expansion crystallized glass essentially consists 40-98 wt % glass powder, 1-55 wt % coloring pigment, and 0-54 wt % filler. The glass powder consists, by weight, of 55-72% SiO.sub.2, 4-8% Al.sub.2 O.sub.3, 14-22% B.sub.2 O.sub.3, 2-4% BaO, 5.1-15% Na.sub.2 O, 0-2% Li.sub.2 O, 0-2.8% K.sub.2 O, and 0-2% F.sub.2.Type: GrantFiled: November 26, 1996Date of Patent: November 25, 1997Inventors: Akihiko Sakamoto, Kiyoshi Katagi, Masayuki Ninomiya
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Patent number: 5674634Abstract: A coatable insulator composition for use in the formation of a green tape comprising fine inorganic micropowders composed of amorphous glass and a refractory oxide in a volatile organic solvent solution of a binder composed of a polymer substance and a plasticizer(s). A green tape obtained by coating said composition over a flexible substrate, and heating and drying this product to remove the organic solvent; and a method for forming a barrier-rib for a plasma display apparatus by sandblast etching using said green tape as an insulator layer for the barrier-rib formation. A use of a pre-formed green tape of uniform thickness in the formation of the barrier-rib of a plasma display apparatus allows the thickness uniformity of the barrier-rib to be improved and the work rationalized, which means that the plasma display apparatus can be made larger and finer, and mass production throughput will be enhanced.Type: GrantFiled: October 12, 1995Date of Patent: October 7, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventors: Carl Baasun Wang, John James Felten, Hiroshi Kanda, Motohiko Tsuchiya
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Patent number: 5650364Abstract: The present invention relates to self-opacifying enamel frit compositions that can be used for the enamelling of aluminium or aluminium alloys.Type: GrantFiled: February 20, 1996Date of Patent: July 22, 1997Assignee: Bayer AktiengesellschaftInventors: Rainer Munstedt, Marc Leveaux, Nancy Crevits, Wolfgang Podesta, Antoine Dhaese
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Patent number: 5643636Abstract: A ceramic color composition comprising from 5 to 34 wt % of a heat resistant color pigment powder, from 65 to 94 wt% of a bismuth type glass powder, from 0 to 10 wt % of a refractory filler powder, and from 0.1 to 20 wt % of at least one additive selected from the group consisting of borides and silicides, as inorganic components.Type: GrantFiled: January 24, 1996Date of Patent: July 1, 1997Assignee: Asahi Glass Company Ltd.Inventors: Hiroshi Usui, Hitoshi Onoda, Tsuneo Manabe
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Patent number: 5643489Abstract: The present invention relates to a manufacturing method of a far infrared ray emitting material having a wavelength of predetermined frequency band and a far infrared ray emitting product using the same, the manufacturing method including steps of: having a mixing vessel containing a predetermined quantity of materials agitated for 0.5-1 hour by a stirrer having a rotative speed of 33 revolution per minute and mixied; and the materials being thrown into a glass dissolving furnace of 1,350-1,550 degrees celsius and fused for 19-21 hours, whereby the predetermined quantity of materials is constituted by silicon oxide of 45-65 weight %, felspar oxide of 7-9 weight %, borax of 10-20 weight %, boric acid of 4-6 weight %, potassium carbonate of 2-4 weight %, nite of 1.0-1.2 weight %, aluminum hydroxide of 3.3-6.8 weight %, limestone of 1.4-1.8 weight %, barium carbonate of 0.8-1.0 weight %, lithium of 0.7-0.8 weight %, zircon of 1.0-1.3 weight %, phosphoric acid of 0.2-0.4 weight %, carbon of 3.0-3.Type: GrantFiled: May 31, 1995Date of Patent: July 1, 1997Inventor: Sung-Jun Jong
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Patent number: 5637261Abstract: Mixed alkaline earth boroaluminate glasses comprising BaO combined with at least one of CaO, SrO and MgO. The glasses are useful as frit binders in aluminum nitride-compatible, thick-film paste compositions used in thick-film printing of hybrid microelectronic circuits on aluminum nitride substrates.Type: GrantFiled: November 7, 1994Date of Patent: June 10, 1997Assignee: The Curators of the University of MissouriInventor: Douglas M. Mattox
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Patent number: 5614330Abstract: An all-ceramic dental restoration comprising a ceramic core over and at least one coating thereon of a porcelain composition having a maturing temperature of from about 850.degree. to about 1050.degree. C. and a coefficient of thermal expansion of from about 4.0 to about 13 (room temperature to 500.degree. C.) parts per million per .degree.C. comprising:______________________________________ Component Amount (Wt. %) ______________________________________ SiO.sub.2 69-75 Al.sub.2 O.sub.3 4.0-9.5 Na.sub.2 O 5-10 K.sub.2 O 0-4 CaO 0-1.5 MgO 0-6 B.sub.2 O.sub.Type: GrantFiled: August 18, 1995Date of Patent: March 25, 1997Assignee: American Thermocraft CorporationInventors: Carlino Panzera, Jana N. Pruden, Richard A. Brightly
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Patent number: 5608373Abstract: A glass frit for firing in reducing environments includes an unusually large amount of calcium fluoride melted therein. Also, a copper conductive composition includes the glass frit with an unusually large amount of calcium fluoride. This copper conductive composition may be a paste prepared for screen printing, in which case an appropriate screening agent known to one of ordinary skill may be incorporated, or the composition may be a fired film formed upon a suitable substrate. A high power surge resistor also incorporates the glass frit.Type: GrantFiled: June 1, 1994Date of Patent: March 4, 1997Assignee: CTS CorporationInventor: Tom O. Martin
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Patent number: 5605869Abstract: An on-glaze low expansion glass flux composition suitable for coating onto a glazed surface which is essentially free from lead and cadmium and comprises, in mole percent, SiO.sub.2 : 35 to 75%, Bi.sub.2 O.sub.3 : 4 to 12%, Al.sub.2 O.sub.3 : 2 to 12%, B.sub.2 O.sub.3 : 18 to 35%, at least one of Li.sub.2 O, Na.sub.2 O, K.sub.2 O : 0 to 12% (in total), and certain other optional ingredients with the provisos that BaO is not contained in an amount of more than 2 mole percent, the total amount of Bi.sub.2 O.sub.3 +B.sub.2 O.sub.3 +Li.sub.2 O,Na.sub.2 O and K.sub.2 O is in the range of from 25 to 45 mole percent, the total amount of Li.sub.2 O, Na.sub.2 O and K.sub.2 O is in the range of up to 10 percent by weight except when the only alkali metal oxide present is Li.sub.2 O, and the composition has a coefficient of thermal expansion in the range of from 4.0 to 7.0.times.10.sup.-6 /.degree.C.Type: GrantFiled: January 30, 1995Date of Patent: February 25, 1997Assignee: Cookson Matthey Ceramics & Materials LimitedInventors: Harbans K. Mangat, Peter J. Smith, Richard J. Hall, Shaun Wingfield
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Patent number: 5597769Abstract: A dielectric ceramic composition having an empirical formula represented by (Sr.sub.l-2x Bi.sub.x Ti.sub.l-y W.sub.y)O.sub.3 wherein x is in a range of 0.0005 to 0.003 and y is in a range of 0.0015 to 0.009 for boundary layer condensers and a method for preparing the same which are comprising the steps of: mixing Bi.sub.2 O.sub.3 -WO.sub.3 frit powder with main component having an empirical formula represented by Sr.sub.l-2x Ti.sub.l-y O.sub.3 wherein x is in a range of 0.0005 to 0.003 and y is in a range of 0.0015 to 0.009, in a wet manner, the Bi.sub.2 O.sub.3 frit serving as a reducing agent; drying the resulting mixture; sintering the dried mixture at a temperature of 1,400 to 1,470.degree. C under a reducing atmosphere; and applying secondary thermal treatment to the sintered body at 1,250.degree. C are disclosed.Type: GrantFiled: April 19, 1995Date of Patent: January 28, 1997Assignee: Korea Institute of Science and TechnologyInventors: Yoon H. Kim, In-Kyu Yoo, Jae-Dong Byun
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Patent number: 5589222Abstract: This invention relates to hydrophobic free-flowing pellets having an average particle size of 5 to 150 .mu.m, which consist of one or preferably more hydrophilic inorganic powders having a particle size of >0 to 30 .mu.m and contain one or more hydrophobic polyorganosiloxanes in a quantity of 0.03 to 15% by weight, to a process for their production and to their use.Type: GrantFiled: February 1, 1996Date of Patent: December 31, 1996Assignee: Ferro (Italia) S.r.l.Inventors: Peter Thometzek, Heinrich Christ
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Patent number: 5552350Abstract: A low-fusing temperature porcelain composition for use in dental prostheses is disclosed having a fusing temperature of about 700.degree. C..+-.50.degree. C. and a coefficient of thermal expansion compatible with a substrate of metal or ceramic. The composition includes, in weight percent of the composition, SiO.sub.2 at 57-61, Al.sub.2 O.sub.3 at 6.5-11.5, Na.sub.2 O at 10-11, K.sub.2 O at 8-16, Li.sub.2 O at 1-3, CaO at 1.5-4, BaO at 1.5-2.5, CeO.sub.2 at 0.5-2, and Tb.sub.2 O.sub.3 at 0.5-2.Type: GrantFiled: December 12, 1994Date of Patent: September 3, 1996Assignee: Ceramco Inc.Inventor: John A. Hornor
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Patent number: 5512521Abstract: A borosilicate glass composition suitable for porcelain enamel applications is disclosed. Accordingly, a black, cobalt-free composition which contains a significant amount of iron oxide was found to be suitable for enameling cast iron and non-pickled steel substrates. The inventive glass is suitable for applications requiring black color, acid resistance, thermal durability and water vapor resistance. In particular, the inventive glass can be used both as a ground coat and a cover coat.Type: GrantFiled: March 9, 1995Date of Patent: April 30, 1996Assignee: Bayer CorporationInventors: Dechun Fu, Vernon J. Grebe
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Patent number: 5504045Abstract: A paint composition containing as a major portion a flux composition including a first flux containing silica, alkali oxide, zinc oxide and boron oxide but containing no lead or lithium and optionally a second flux, and minor portions of pigment and a liquid medium, particularly suited for automobile windshields.Type: GrantFiled: October 14, 1994Date of Patent: April 2, 1996Assignee: The O. Hommel CompanyInventors: Hasan B. Emlemdi, Robert M. Koceski, Harold C. Kersteen, Robert A. Prunchak, Matthew Sgriccia
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Patent number: 5491118Abstract: The invention is directed to a lead-free and cadmium-free thick film paste composition suitable for forming resistor or thermistor patterns on a substrate.Type: GrantFiled: December 20, 1994Date of Patent: February 13, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventor: Jacob Hormadaly
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Patent number: 5447891Abstract: The invention concerns a lead-free glaze or enamel for use on ceramic bodies such as bone china. In one embodiment the glaze or enamel includes a hard glass frit which comprises by weight percent from about 45% to about 70% SiO.sub.2, from about 4% to about 15% B.sub.2 O.sub.3, from about 4% to about 17% Al.sub.2 O.sub.3, from about 1% to about 9% Na.sub.2 O, from about 1% to about 9% K.sub.2 O, from about 0.2% to about 5% Li.sub.2 O, from about 0.4% to about 12% CaO, from about 0.1% to about 7% ZrO.sub.2, up to about 3% ZnO, up to about 2% WO.sub.3, up to about 2% Bi.sub.2 O.sub.3, and up to about 2% MoO.sub.3.Type: GrantFiled: September 29, 1993Date of Patent: September 5, 1995Assignee: Ferro CorporationInventors: Emilio D. Spinosa, Kevin J. Davies
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Patent number: 5439852Abstract: The invention is directed to a thick film paste composition comprising electrically conductive particles and finely divided particles of a glass composition comprising by mole % 5-70% Bi.sub.2 O.sub.3, 18-35% SiO.sub.2, 0.1-40% CuO, 0.5-25% ZnO, 0.5-40% CoO, 0.5-40% Fe.sub.2 O.sub.3, and 0.5-40% MnO, which the glass composition is free of lead and cadmium, all dispersed in an organic medium.Type: GrantFiled: August 1, 1994Date of Patent: August 8, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventor: Jacob Hormadaly
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Patent number: 5429670Abstract: An improved gold paste for use in the manufacture of ceramic circuit boards is disclosed, which has a composition comprising an inorganic component, an organic binder, a solvent. The inorganic component contains (a) 84-94 wt % powdery gold with a particle size of 0.3-0.7 .mu.m, (b) 0.3-2.0 wt % powdery V.sub.2 O.sub.5 with a particle size of 0.3-2.0 .mu.m, and (c) 0.3-2.0 wt % powdery CuO with a particle size of 0.3-2.0 .mu.m.Type: GrantFiled: February 10, 1994Date of Patent: July 4, 1995Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Akihiko Miyoshi
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Patent number: 5393714Abstract: The present invention provides free-flowing chemically resistant color granulates that are heat resistant and color stable in aggressive media. The color granulates comprise 20-94.8% by weight coloring bodies, 5-75% by weight of one or more frits, 0.220% by weight binder and 0.03-15% by weight organosilanes and/or polyorganosiloxanes. The glass frit comprises by weight 20-90% SiO.sub.2 +B.sub.2 O.sub.3 +Al.sub.2 O.sub.3, 0-6% Na.sub.2 O+Li.sub.2 O, 0-6% K.sub.2 O, 10-25% CaO+MgO+ SrO, 0-35% TiO.sub.2 +ZrO.sub.2, 0-40% Bi.sub.2 O.sub.3 +P.sub.2 O.sub.5 +V.sub.2 O.sub.5 +MoO.sub.3 +WO.sub.3 and 0-10% ZnO.Type: GrantFiled: December 29, 1993Date of Patent: February 28, 1995Assignee: Ferro Italia S.r.l.Inventors: Peter Thometzek, Heinrich Christ
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Patent number: 5376596Abstract: A conductive paste contains at least a conductive powder and a glass frit. The glass frit includes 9.0 to 45.0 wt % of SiO.sub.2 and 1.0 to 18.5 wt % of CaO, the balance being ZnO, B.sub.2 O.sub.3 and Li.sub.2 O. The glass frit may contain not more than 6.0 wt % of Al.sub.2 O.sub.3 incorporated therein as additive.Type: GrantFiled: August 4, 1993Date of Patent: December 27, 1994Assignee: Murata Manufacturing Co., Ltd.Inventors: Yu Tokuda, Kunihiko Hamada
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Patent number: 5362687Abstract: A lead-free frit glaze consisting of, by mole %, 61% or greater SiO.sub.2, 8-10% Al.sub.2 O.sub.3, 0.1-3% CaO, 0.1-2% MgO, 2-5% Li.sub.2 O, 1-4% K.sub.2 O, 2-6% Na.sub.2 O, and 10-15% B.sub.2 O.sub.3. The glaze is applied over the surface of ceramic biscuit base and fired therewith. Although the glaze contains no lead, the lead-free frit glaze provides excellent gloss and excellent quick cooling resistance.Type: GrantFiled: February 3, 1993Date of Patent: November 8, 1994Assignee: Narumi China CorporationInventor: Yasuyuki Tokunaga
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Patent number: 5350718Abstract: Glass frits are disclosed which are essentially free of lead and contain 0.05 to 15 mol-% sulfur and/or sulfides, preferably zinc sulfide. A process is disclosed for producing a glass frit by melting a mixture of oxides and/or non-oxide compounds (fluorides, carbonates) at temperatures of 1,000.degree. to 1,300.degree. C., followed by sudden cooling, characterized in that the glass frit contains between 0.05 and 15 mol-% sulfur, zinc sulfide or other sulfides. The glass frits can be used in enamel barrier layers for stopping the migration of silver.Type: GrantFiled: September 1, 1993Date of Patent: September 27, 1994Assignee: Degussa AktiengesellschaftInventors: Jerome Anquetil, Alain Dauger
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Patent number: 5348915Abstract: Lead-free ceramic frits for producing glazes with intrinsic opacity, and methods of coationg ceramic substrates with the ceramic frits, wherein the ceramic frits have the following composition:______________________________________ SiO.sub.2 48-60 wt. % B.sub.2 O.sub.3 3-8 wt. % Al.sub.2 O.sub.3 4-8 wt. % Na.sub.2 O 0.2-2.0 wt. % K.sub.2 O 4-8 wt. % MgO 0-2 wt. % CaO 7.5-13 wt. % BaO 0-5 wt. % ZnO 7-12 wt. % ZrO.sub.2 0.3-2.5 wt. % TiO.sub.2 3.5-5.5 wt. % P.sub.2 O.sub.5 0-3 wt. % and Na.sub.2 O + K.sub.2 O 4.5-8.5 wt. %.Type: GrantFiled: March 19, 1993Date of Patent: September 20, 1994Assignee: Ferro CorporationInventor: Peter Thometzek
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Patent number: 5346866Abstract: A dental ceramic material is disclosed for the preparation and repair of metal ceramic and fully ceramic dentures, which has a processing temperature of 660.degree..+-.30.degree. C., and has the following composition: 60 to 65% by weight of SiO.sub.2, 8.5 to 11% by weight of Al.sub.2 O.sub.3, 8 to 12% by weight of K.sub.2 O, 10.5 to 12% by weight of Na.sub.2 O, 0.7 to 2% by weight of CaO, 0.5 to 2.5% by weight of B.sub.2 O.sub.3, 0.1 to 0.6% by weight of Sb.sub.2 O.sub.3, 0 to 0.5% by weight of CeO.sub.2, 1.0 to 3.8% by weight of TiO.sub.2, 0.8 to 1.4% by weight of Li.sub.2 O, and 0.6 to 2.4% by weight of F.sub.2.Type: GrantFiled: October 28, 1993Date of Patent: September 13, 1994Assignees: Degussa Aktiengesellschaft, Ducera Dental Gesellschaft mbHInventors: Ottmar Komma, Juergen Steidl
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Patent number: 5338710Abstract: A ceramic substrate sintered at low temperature comprising: 20 to 50% by volume of an anorthite (CaAl.sub.2 Si.sub.2 O.sub.8) crystal phase, 1 to 20% by volume of a gahnite (ZnAl.sub.2 O.sub.4) crystal phase and the balance of a glass phase and, further, containing 35 to 50% by weight of alumina (Al.sub.2 O.sub.3) as a filler. Since the substrate can be sintered at a temperature lower than 900.degree. C., has a mechanical strength as large as more than 2500 kgf/cm.sup.2 and a thermal expansion coefficient of less than 60.times.10.sup.-7 /.degree.C., Au Ag and Cu can be used as a conductor and the substrate can be used like that existent alumina substrate.Type: GrantFiled: October 13, 1993Date of Patent: August 16, 1994Assignee: Sumitomo Metal Mining Company, LimitedInventors: Juji Ishigame, Yoshiaki Matsumura
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Patent number: 5330939Abstract: A vitreous ceramic composition for coating ceramic articles with a zinc and alumina base capable of separating rapidly up to 50% of crystalline phase consisting essentially of gahnite. The percentages by weight of the principal ingredients of the composition are the following. SiO.sub.2 30-50%; Al.sub.2 O.sub.3 10-25%; ZnO 8-25%; B.sub.2 O.sub.3 5-20%; TiO.sub.2 0-7%; other selected oxides can be added to change the fusability characteristics and heat expansion coefficients on the basis of specific applications of the composition.Type: GrantFiled: November 23, 1993Date of Patent: July 19, 1994Assignee: Ceramica Filippo Marazzi S.p.A.Inventors: Filippo Marazzi, Mariano Paganelli
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Patent number: 5326728Abstract: This invention is directed to the production of lead-free enamels containing finely-divided glass particles, finely-divided pigment particles, and an organic binder wherein the glass particles consist essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 35-50 Li.sub.2 O + Na.sub.2 O + K.sub.2 O <8 B.sub.2 O.sub.3 23-30 CaO 1-5 Al.sub.2 O.sub.3 10-22 CaO + MgO + ZnO + BaO + SrO <7 Li.sub.2 O 1-3 TiO.sub.2 0-2 Na.sub.2 O 0-3 ZrO.sub.2 0-5 K.sub.2 O 2-5 ______________________________________said glass having a softening temperature T.sub.L above 650.degree. C. and thermal expansion coefficient below 60.times.10.sup.-7 /.degree.C. Among other applications, said glass can be used for the decoration of low-expansion glass-ceramic cooking plates.Type: GrantFiled: October 12, 1993Date of Patent: July 5, 1994Assignee: Corning IncorporatedInventors: Gerard R. M. Boury, Daniel L. G. Ricoult
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Patent number: 5308803Abstract: A glass composition which is essentially free from lead and cadium comprises, in mole percent, SiO.sub.2 :35 to 75%, Bi.sub.2 O3:0.1 to 15%, Al.sub.2 O.sub.3 :0.1 to 10%, B.sub.2 O.sub.3 :1 to 30%, at least one of Li.sub.2 O, Na.sub.2 O, K.sub.2 O:5 to 30%, ZrO.sub.2 :0.1 to 10%, and certain other optional ingredients, with the proviso that BaO and ZnO are not contained in an amount of more than 2 mole percent. These glass compositions can be used as fluxes for mixing with pigments to provide compositions for the decoration of ceramic materials and/or glass.Type: GrantFiled: June 10, 1992Date of Patent: May 3, 1994Assignee: Cookson Group PLCInventors: John F. Clifford, Ivan Wozniak, Peter J. Smith
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Patent number: 5306674Abstract: This invention relates to a lead-free glass coating made by firing a lead-free glass enamel composition comprising a glass frit having by weight from about 20% to about 40% zinc oxide, from about 20% to about 32% boron oxide, and from about 10% to about 30% silicon dioxide, from about 0% to about 12% titanium dioxide, from about 4% to about 12% sodium oxide, from about 0% to about 10% potassium oxide, from about 0% to about 12% zirconia, up to about 4% alumina, up to about 5% lithium and up to about 5% fluorine. The lead-free glass coating exhibits excellent adhesion and improved acid resistance.Type: GrantFiled: September 4, 1992Date of Patent: April 26, 1994Assignee: Ferro CorporationInventors: Clifford G. Ruderer, Gordon J. Roberts, Hasan B. Emlemdi
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Patent number: 5304518Abstract: A hybrid package comprising a glass ceramic substrate and an aluminum nitride substrate bonded thereto, said glass ceramics substrate has a thermal expansion coefficient substantially the same as that of the aluminum nitride substrate.Type: GrantFiled: June 18, 1991Date of Patent: April 19, 1994Assignee: Asahi Glass Company Ltd.Inventors: Kazuo Sunahara, Naosi Irisawa, Katumasa Nakahara, Kazunari Watanabe, Mitsuo Takabatake
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Patent number: 5304516Abstract: Glaze composition comprises 45 to 75% of SioO.sub.2, 0.1 to below 5% of Bi.sub.2 O.sub.3, 0.1 to 20% of Al.sub.2 O.sub.3 to 20% of B.sub.2 O.sub.3, at least one of CaO, MgO, SrO, BaO or Zno in an amount of 2 to 22%, at least one of Li.sub.2 O, Na.sub.2 O, K.sub.2 O in an amount of 1 to 10%, at least one of La.sub.2 O.sub.3, MoO.sub.3 or WO.sub.3 in an amount of 0.1 to 10% and certain other optional ingredients, all percentages being percentages by weight based on the total weight of the glaze composition, the glaze composition having a firing temperature of 950.degree. to 1250.degree. C., and having a coefficient of thermal expansion of 50 to 100.times.10.sup.-7 /.degree.C.Type: GrantFiled: April 16, 1992Date of Patent: April 19, 1994Assignee: Cookson Group PLCInventor: John F. Clifford
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Patent number: 5296415Abstract: A CeO.sub.2 -containing enamel frit is disclosed which, upon enamelling, produces an opaque enamel coating with excellent adhesion and acid resistance. The frit can be used to enamel an unpickled or lightly pickled steel plate or article.Type: GrantFiled: July 10, 1992Date of Patent: March 22, 1994Assignee: Bayer AGInventor: Wolfgang Podesta
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Patent number: 5283211Abstract: This invention relates to thallium germanate, tellurite, and antimonite glasses possessing high optical nonlinearity, as well as good visible and infrared transmission, making them suitable materials for the fabrication of active optical devices.Type: GrantFiled: September 21, 1992Date of Patent: February 1, 1994Assignee: Corning IncorporatedInventors: Bruce G. Aitken, Douglas W. Hall, Mark A. Newhouse
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Patent number: 5277946Abstract: In a borosilicate glass plate containing Li.sub.2 O, Na.sub.2 O and K.sub.2 O and for use as a window plate in an alumina package for containing a semiconductor device, Li.sup.+ and Na.sup.+ ions are partially ion-exchanged by K.sup.+ ions in a surface of the glass plate to form a surface layer having a compressive stress of 200 Kg.f/cm.sup.2 or more, in order to make a thin window glass plate for the package having a thickness of 0.7 mm or less and a sufficient mechanical strength. The glass also has a thermal expansion coefficient of 50-75.times.10.sup.-7 /.degree. C. over a temperature range of 30.degree.-380.degree. C. so as to be thermally compatible with the alumina package. The glass consists essentially of SiO.sub.2 55-64%, Al.sub.2 O.sub.3 7-20%, B.sub.2 O.sub.3 11-19%, Li.sub.2 O 0-8%, Na.sub.2 O 7-20%, K.sub.2 O 0-4%, and RO 0.5-7% on the base of weight percent, where R is at least one of Mg, Ca, Sr, and Ba. In order to insure the ion exchange, amounts of Li.sub.2 O, Na.sub.2 O and K.sub.Type: GrantFiled: September 1, 1992Date of Patent: January 11, 1994Assignee: Nippon Electric Glass Co., Ltd.Inventors: Hiroki Nagai, Shigeru Yamamoto
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Patent number: 5275649Abstract: A new doped zirconium mixed silicate pigment has been found, having a particle size D.sub.50 of 3 .mu.m or less and a molar ratio of zirconium dioxide/silicon dioxide that deviates from the stoichiometric ratio and is in the range of 1/1.5-1/36. This new pigment is doped with 1-25% by weight of a color-providing metal oxide an exhibits great color strength as well as good thermostability. The new pigment, which has a very high particle fineness, can be used for ceramic applications and for coloring glass, but is also particularly suitable for applications outside the ceramic field, in particular as a colorant in plastics, rubber, paint, printing ink and cosmetic products. Further, a similar new doped zirconium silicate pigment has been found, which, however, has a D.sub.50 particle size that is greater than 3 .mu.m, the molar ratio of zirconium dioxide/silicon dioxide being in the range of 1/4.9-1/36. The last-mentioned pigment is very suitable to be incorporated into glass.Type: GrantFiled: February 18, 1993Date of Patent: January 4, 1994Assignee: ColoRSil B.V.Inventors: Erich A. E. Linke, Cornelis H. Zwart, Adrianus D. Smout
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Patent number: 5270268Abstract: A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 5.5 and a TCE of less than about 3.5 ppm/.degree.C. The composition comprises a mixture of finely divided particles of 20-80 vol. % borosilicate glass and 20-80 vol. % of Al.sub.x B.sub.y O.sub.z wherein x is in the range of 4 to 22, y is in the range of 2 to 5, and z is in the range of 9 to 36. The Al.sub.x B.sub.y O.sub.z inhibits the formation of crystalline forms of silica. The composition can be used with a polymeric binder to produce an unfired green tape which is co-fireable with high conductivity metallurgies such as gold, silver and silver/palladium.Type: GrantFiled: September 23, 1992Date of Patent: December 14, 1993Assignee: Aluminum Company of AmericaInventors: Jau-Ho Jean, Tapan K. Gupta