Zinc, Or Cadmium Containing Patents (Class 420/504)
  • Patent number: 10900101
    Abstract: The present invention relates to a copper alloy for dental prosthesis and specifically, to a copper alloy for dental prosthesis having such color and luster that the copper alloy can be used as a substitute for a gold alloy and having excellent resistance to corrosion, wherein the copper alloy comprises, in wt %, 7-10% of Al, 1-2.5% of In, 1-2.5% of Sn, 2-4% of Fe, 2-3.5% of Ni, 2.5-4% of Mn, 2-5% of Zn, and the balance Cu.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: January 26, 2021
    Inventor: Dong Han Park
  • Patent number: 8771591
    Abstract: A high tarnish resistant silver alloy composition formulated for jewelry and flatware manufacture is provided. In certain implementations, the alloy contains about 92%-97% by weight silver, about 0.25%-3.5% by weight palladium, about 0%-3.5% by weight platinum, about 0%-2.5% by weight gold, about 0.1%-1.0% by weight copper, about 0.5%-3.5% by weight zinc, about 0.1%-1.5% by weight tin, about 0.25%-1.5% by weight indium, about 0.03%-1.1% by weight silicon, about 0%-0.5% by weight germanium, about 0.15%-0.5% by weight gallium, about 0.25%-0.5% by weight cobalt and about 0%-0.5% by weight ruthenium. These unique combinations of elements result in the alloys with the tarnish resistance superior to typical 10K gold alloy.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: July 8, 2014
    Assignee: American Bullion Investment Company, Inc.
    Inventor: Charles Bennett
  • Patent number: 8668787
    Abstract: It is an object of the present invention to provide a Ag—Pd—Cu—Ge type silver alloy which can form a reflective electrode film having such two characteristics that it is very reduced in the lowering of reflectance caused by thermal deterioration and has resistant to yellowing caused by sulfurization even after a heating step in a process of producing a color liquid crystal display. The silver alloy according to the present invention includes a composition containing at least four elements including Ag as its major component, 0.10 to 2.89 wt % of Pd, 0.10 to 2.89 wt % of Cu and 0.01 to 1.50 wt % of Ge, and the total amount of Pd, Cu and Ge is 0.21 to 3.00 wt %.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: March 11, 2014
    Assignee: Furuya Metal Co., Ltd.
    Inventor: Atsushi Watanabe
  • Publication number: 20130126934
    Abstract: A bonding wire for semiconductor devices and a method of manufacturing the wire are provided. The bonding wire contains at least one element selected from zinc, tin, and nickel in an amount of 5 ppm to 10 wt %, the remainder containing silver and inevitable impurities. The method involves pouring a silver alloy according to the invention into a mold and melting the silver alloy, continuously casting the melted silver alloy, and drawing the continuously casted silver alloy.
    Type: Application
    Filed: November 19, 2012
    Publication date: May 23, 2013
    Applicant: Heraeus Materials Technology GmbH & Co. KG
    Inventor: Heraeus Materials Technology GmbH & Co. KG
  • Patent number: 8360176
    Abstract: A method for a down hole cutting tool is disclosed, wherein the cutting tool includes a cutting element support structure having at least one cutter pocket to support a cutting element comprising a substrate and an ultrahard layer. The method includes inserting a base portion of the cutting element into the cutter pocket; locating a first braze alloy such that when heated the first braze alloy melts and fills a space in the cutter pocket between the cutting element and the cutting element support structure adjacent the ultrahard layer; locating a second braze alloy such that when heated the second braze alloy melts and fills a space in the cutter pocket between the cutting element and the cutting element support structure non-adjacent the ultrahard layer; and heating the first and second braze alloy such that they melt.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: January 29, 2013
    Assignee: Smith International, Inc.
    Inventors: Youhe Zhang, Yuelin Shen, Hong Deng
  • Publication number: 20130004363
    Abstract: A new nickel-free sterling silver alloy with superior tarnish resistant, yet substantially similar cold working and mechanical properties is disclosed using a specified mixture of zinc, copper, silicon, iridium, and indium with pure silver. A new and improved method of manufacture involving a four-step process whereby the non-silver components are fabricated in an inert gas or reducing atmosphere into a master alloy of pre-determined composition, and in a final step mixed with a predetermined mass of pure silver to produce the new alloy.
    Type: Application
    Filed: July 2, 2012
    Publication date: January 3, 2013
    Inventors: Arthur Taylor, Bernard Madden
  • Patent number: 8252127
    Abstract: This invention provides sputtering target materials having high reflectance and excellent heat resistance, which are formed of Ag base alloys formed by adding a specific, minor amount of P to Ag and alloying them.
    Type: Grant
    Filed: May 6, 2011
    Date of Patent: August 28, 2012
    Assignee: Ishifuku Metal Industry Co., Ltd.
    Inventors: Koichi Hasegawa, Nobuo Ishii
  • Publication number: 20120207643
    Abstract: A homogenous brazing material essentially consisting of relatively low amounts of silver and nickel together with copper, zinc, and other constituents is provided. The brazing material has a working temperature exceeding 630° F. and is preferably between about 1250° F. and 1500° F. The brazing material preferably has about 30 percent by weight of silver, about 36 percent by weight of copper, about 32 percent by weight of zinc, and about 2 percent by weight of nickel. The addition of nickel in the above-specified amount improves resistance against interface corrosion in aqueous solutions, aids in the strength of the alloy, and provides improved wettability on ferrous and non-ferrous substrates. The brazing material may also include a flux, such as a core or a coating.
    Type: Application
    Filed: October 21, 2010
    Publication date: August 16, 2012
    Applicant: LUCAS-MILHAUPT, INC.
    Inventors: Alan Belohlav, Marcin Kuta
  • Publication number: 20120080216
    Abstract: Provided are a brazing material capable of being restrained from protruding unnecessarily in a joint region; a heat dissipation base having a high reliability of electric insulation, and does not easily cause a short circuit even when the base dissipates heat repeatedly; and an electronic device wherein an electronic component is mounted on circuit members of this heat dissipation base. The brazing material comprises silver and copper as main components; at least one element A selected from indium, zinc, and tin; at least one element B selected from titanium, zirconium, hafnium, and niobium; and at least one element C selected from molybdenum, osmium, rhenium, and tungsten.
    Type: Application
    Filed: May 27, 2010
    Publication date: April 5, 2012
    Applicant: KYOCERA CORPORATION
    Inventors: Yuuichi Abe, Kiyotaka Nakamura, Kiyoshi Yakubo
  • Patent number: 7959855
    Abstract: The present disclosure relates to white precious metal alloy compositions comprising at least one of platinum and palladium alloyed with gold, silver, and optionally one or more additional alloying elements. More specifically, and in one embodiment, the present disclosure relates to white precious metal alloy compositions that are suitable for the manufacture of jewelry and other finished articles. In addition, the present invention also relates to a method of manufacturing finished articles from such white precious metal alloy compositions.
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: June 14, 2011
    Inventor: Heru Budihartono
  • Publication number: 20110052444
    Abstract: A solder alloy suitable for high temperature environments, such as for example electronic systems used in an oil or gas well where the temperature may be in the region of 175° C., the solder alloy having a Silver weight % in the range of 3.5 to 7.0, a Copper weight % in the range of 1.0 to 4.0, and an Antimony weight % in the range of 1.0 to 3.0. Other embodiments are described and claimed.
    Type: Application
    Filed: December 13, 2006
    Publication date: March 3, 2011
    Inventors: Andy A. Hrametz, Alex T. Duncan
  • Patent number: 7876017
    Abstract: An object of the present invention is to provide a commutator or brush material for a small electric DC motor which enables a lengthened operating life of a spindle motor for a DVD controlled using a pulse current. A commutator material for a small electric DC motor in accordance with the present invention is characterized by being composed of 6.0 to 10.0 wt % of Cu, 1.0 to 5.0 wt % of ZnO, and a balance of Ag and in that Cu metal particles and ZnO particles are dispersed in an AgCu matrix. A brush material for a small electric DC motor in accordance with the present invention is characterized by being composed of 0.1 to 5.0 wt % of MgO and a balance of Ag and in that MgO particles are dispersed in an Ag matrix, or is characterized by being composed of 5.0 to 15.0 wt % of Ni and a balance of Pt and in that Ni is dissolved in a Pt matrix.
    Type: Grant
    Filed: May 10, 2006
    Date of Patent: January 25, 2011
    Assignees: Mabuchi Motor Co., Ltd., Tanaka Kikinzoku Kogyo K.K.
    Inventors: Keiji Nakamura, Makoto Takabatake, Masahiro Takahashi, Shuichi Kubota, Takao Asada, Toshiya Yamamoto
  • Publication number: 20100239454
    Abstract: A firestain and tarnish-resistant ternary alloy of silver, copper and germanium contains from more than 93.5 wt % to 95.5 wt % Ag, from 0.5 to 3 wt % Ge, optionally 0.5 wt % Zn and the remainder, apart from incidental ingredients (if any), impurities and grain refiner, copper. In order to further protect an article made from the alloy, it may be surface treated with an alkanethiol, alkyl thioglycollate, dialkyl sulphide or dialkyl disulphide. Embodiments of the above alloy exhibit relatively low elution of copper when subjected to a simulated sweat test.
    Type: Application
    Filed: April 23, 2010
    Publication date: September 23, 2010
    Applicant: Argentium International Limited
    Inventor: Peter Gamon Johns
  • Publication number: 20090205369
    Abstract: A silver-palladium alloy formulated to provide an alloy with a whiter color and superior casting and fabrication properties as compared to nickel-based white gold and also to impart to an article of jewelry or the like favorable properties afforded by white gold. The alloy generally includes silver and palladium, with silver being the predominant component. In some embodiments, the alloy contains about 75%-85% silver and about 5%-15% palladium by weight.
    Type: Application
    Filed: February 13, 2009
    Publication date: August 20, 2009
    Inventor: Charles Bennett
  • Publication number: 20080166260
    Abstract: Silver alloy compositions having reduced susceptibility to sulphidation and reduced susceptibility to fire stain relative to 92.5% silver 7.5% copper alloy, and having mechanical properties for casting and forming comparable to or better than 92.5% silver 7.5% copper alloy, and having an appearance similar to 92.5% silver 7.5% copper alloy. The silver alloy compositions include at least 92.5% silver 2.0%-4.0% tin; 1.7%-2.6% zinc and 0.50%-1.5% indium.
    Type: Application
    Filed: February 3, 2006
    Publication date: July 10, 2008
    Applicants: CARRS OF SHEFFIELD (MANUFACTURING) LIMITED, SHEFFIELD HALLAM UNIVERSITY, CENTRE STEPHANOIS DE RECHERCHES MECANIQUES
    Inventors: Frederic Faverjon, Alan G. Hopkinson, James Storey
  • Patent number: 7198683
    Abstract: A sterling silver alloy composition of exceptional and reversible hardness and enhanced tarnish resistance, consists essentially of the following parts by weight: at least about 92.5% silver; about 4.4% to about 5.25% copper; about 0% to about 1.0% zinc; about 0.85% tin; about 0.05% to about 0.3% lithium; about 0.05% to about 0.5% silicon; about 0% to about 1.2% germanium; and about 0% to about 0.02% boron.
    Type: Grant
    Filed: August 26, 2004
    Date of Patent: April 3, 2007
    Assignee: Leach & Garner Company
    Inventors: Dwarika P. Agarwal, Grigory Raykhtsaum
  • Patent number: 7160632
    Abstract: The invention provides a material for sliding contacts that is suitable for a small-sized DC motor used in recent downsized CD players and is excellent in durability. A material for sliding contacts used in a commutator of a small-sized DC motor that consists essentially of 0.01 to 3.0% Ni by weight, 0.01 to 6.0% ZnO by weight and/or 0.01 to 3.0% MgO by weight, furthermore, in some cases, 0.01 to 5.0% Cu by weight, and the balance Ag, in which Ni metal particles, ZnO particles or MgO particles are dispersed in the matrix of Ag.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: January 9, 2007
    Assignees: Mabuchi Motor Co., Ltd., Tanaka Kikinzoku kogyo K.K.
    Inventors: Keiji Nakamura, Yasuhiro Hashimoto, Masahiro Takahashi, Shuichi Kubota, Takao Asada, Toshiya Yamamoto
  • Patent number: 7128871
    Abstract: A silver-colored, tarnish-resistant, corrosion-resistant alloy is provided. The alloy includes 92.5–95% silver, combined with a master alloy of 24–34% zinc; 60–74% copper; 0.5–1.8% silicon; 0.0–8.0% tin, or 0.0–1.5% indium, wherein percentages are in terms of weight. The alloy can be used for jewelry items, tableware items, dental items or other items that should resist tarnishing or corrosion and which require a non-brittle alloy.
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: October 31, 2006
    Assignee: Sterilite LLC
    Inventor: Daniel Davitz
  • Patent number: 7128792
    Abstract: A unique manganese silver alloy composition is provided, which alloy exhibits the long desired properties of exceptional as-cast hardness and reversible heat treatability, in addition to offering reduced fire scale, reduced voids and porosity, reduced grain size, and reduced oxide formation when heated consisting essentially of the following parts by weight: about 92.5–92.8% silver, about 2.0–3.0% copper, about 2.0–3.0% zinc, about 0.03–0.05% indium, about 0.01–0.03% tin, about 0.20–0.50% boron/copper alloy (22% boron, 98.0% copper) about 0.50–0.90% silicon/copper alloy (10.0% silicon, 90.0% copper), and 0.01%–0.10% manganese “30” (0.30% of a manganese-copper alloy containing about 30% manganese and about 70% copper).
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: October 31, 2006
    Assignee: United Precious Metal Refining, Inc.
    Inventor: Ajit B. Menon
  • Patent number: 6913657
    Abstract: A hard precious metal alloy member is constituted of a gold alloy, which has a gold Au content of from 37.50 to 98.45 wt %, and contains a hardening additive in a range of not less than 50 ppm but less than 15,000 ppm, wherein the hardening additive is constituted of gadolinium Gd only, or gadolinium Gd and at least one element selected from the group consisting of rare-earth elements other than Gd, alkaline-earth elements, silicon Si, aluminum Al, and boron B.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: July 5, 2005
    Inventor: Kazuo Ogasa
  • Patent number: 6841012
    Abstract: An anti-tarnish silver alloy is provided including at least about 85% silver, with the balance including zinc, copper, indium, and tin. Also provided are articles made from the alloy and methods of making the articles.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: January 11, 2005
    Assignee: Steridyne Laboratories, Inc.
    Inventor: Scott M. Croce
  • Publication number: 20040219055
    Abstract: An anti-tarnish silver alloy is provided including at least about 85% silver, with the balance including zinc, copper, indium, and tin. Also provided are articles made from the alloy and methods of making the articles.
    Type: Application
    Filed: August 7, 2003
    Publication date: November 4, 2004
    Applicant: Steridyne Laboratories, Inc.
    Inventor: Scott M. Croce
  • Patent number: 6726877
    Abstract: Silver alloys having properties of fire scale resistance, reduced porosity and oxide formation and reduced grain size relative to traditional sterling silver alloys and useful work hardening performance are provided, comprising about 80-99.0% by weight silver, about 0.5-6% by weight copper, about 0.02-7% by weight of a firescale resisting additive selected from one or a mixture of zinc and silicon, and about 0.01-2.5% by weight germanium. Master alloys for production of the above alloys are also provided for, having the general composition comprising, by weight, about 2.5-99.85% copper, about 0.1-35% zinc or silicon or mixtures thereof, and about 0.05-12.5% germanium.
    Type: Grant
    Filed: May 8, 1996
    Date of Patent: April 27, 2004
    Inventor: Anthony Phillip Eccles
  • Patent number: 6299835
    Abstract: Cadmium-free hard solders having working temperatures of less than 630° C., which are easily workable and yield ductile soldered joints, are composed of 30 to 60% by weight of silver, 10 to 36% by weight of copper, 15 to 32% by weight of zinc, 0.5 to 7% by weight of gallium, 0.5 to 7% by weight of tin and 0 to 5% by weight of indium.
    Type: Grant
    Filed: July 12, 1994
    Date of Patent: October 9, 2001
    Assignee: Degussa AG
    Inventors: Wolfgang Weise, Willi Malikowski, Dieter Kaufmann, Harald Krappitz
  • Patent number: 6245166
    Abstract: An object of the present invention is to provide a material for a sliding contact whose alloy composition does not contain an environmentally detrimental substance such as Cd, which exhibits excellent contact resistance, whose electrical functions are good and free of time-course variation, and which further exhibits excellent wear resistance. The material for a sliding contact assumes the form of an Ag—Zn—Pd, Ag—Zn—Pd—Cu, Ag—Zn—Pd—Ni, or Ag—Zn—Pd—Cu—Ni alloy. In the compositions of these alloys, the Zn content is 0.1-3.0% by weight, the Pd content is 0.1-1.5% by weight, and the balance is Ag. When Cu is contained, the Cu content is 0.1-3.0% by weight. When Ni is contained, the Ni content is 0.01-0.5% by weight. Zn, Pd, and Cu are present in the Ag &agr; phase in the form of solid solution. Ni particles are finely dispersed in the alloys. A composite clad material is formed through use of the material for a sliding contact.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: June 12, 2001
    Assignees: Mabuchi Motor Co., Ltd, Tanaka Kikinozoku Kogyo K.K.
    Inventors: Isao Shibuya, Keiji Nakamura, Kenji Shiraki, Toshiya Yamamoto, Takao Asada
  • Patent number: 5972131
    Abstract: An Ag--Cu alloy for a sliding contact containing:a) 0.1 to 8.0 wt. % of Cu, based on the weight of the alloy, wherein at least 70 wt. % of the Cu contained in the alloy is solid-solubilized in an Ag-.alpha.-phase; andb) 0.1 to 4.0 wt. %, based on the weight of the alloy, of at least one metal selected from the group consisting of Ge, Ni, Sn, In, Zn, Mg, Mn, Sb, Pb and Bi.The Ag--Cu alloy is desirably utilized to form a composite with a Cu or Cu alloy base material. Such composite has been found to be very useful for fabricating the commutator of a compact DC motor.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: October 26, 1999
    Assignees: Tanaka Kikinzoku Kogyo K.K., Mabuchi Motor Co., Ltd.
    Inventors: Takao Asada, Keiji Nakamura, Isao Shibuya, Toshiya Yamamoto, Tetsuya Nakamura, Kiyoshi Nakama
  • Patent number: 5882441
    Abstract: A silver colored alloy, highly tarnish resistant, corrosion resistant and brittleness free is provided. The alloy includes 90% to 94% by weight silver, 3.50% to 7.35% by weight zinc, 1% to 3% by weight copper, and 0.1% to 2.5% by weight silicon. The alloy is suitable for rings, earrings, bangles and other jewelry.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: March 16, 1999
    Inventor: Daniel Davitz
  • Patent number: 5817195
    Abstract: A silver colored alloy highly tarnish resistant, sterling silver is provided or having included therein: 90% to 92.5% by weight Silver; 5.75% to 7.5% by weight Zinc; 0.25% to less than 1% by weight Copper; 0.25% to 0.5% by weight Nickel; 0.1% to 0.25% by weight Silicon; and 0.0% to 0.5% by weight Indium.
    Type: Grant
    Filed: November 19, 1996
    Date of Patent: October 6, 1998
    Assignee: Astrolite Inc.
    Inventor: Daniel Davitz
  • Patent number: 5531962
    Abstract: Cadmium-free brazing solders with working temperatures under 630.degree. C. containing 45 to 80 wt. % silver, 14 to 25 wt. % copper 10 to 25 wt. % gallium, 1 to 7 wt. % zinc and 0 to 5 wt. % indium and/or tin. The alloys have good cold workability and ductility.
    Type: Grant
    Filed: August 3, 1994
    Date of Patent: July 2, 1996
    Assignee: Degussa Aktiengesellschaft
    Inventors: Wolfgang Weise, Alexander Voelcker, Dieter Kaufmann, Willi Malikowski, Joerg Beuers, Harald Krappitz
  • Patent number: 5250229
    Abstract: The invention is directed to a thermal cycle adhesion additive composition consisting essentially of an admixture of finely divided particles of oxides of bismuth, copper, lead, zinc, and transition metal and to conductive thick film compositions made therefrom.
    Type: Grant
    Filed: October 10, 1991
    Date of Patent: October 5, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Hiroyuki Hara, Marc H. La Branche, Barry E. Taylor
  • Patent number: 5185125
    Abstract: A dental alloy having, upon amalgamation, a desirable combination of physical properties and both a desirable condense time and carve time. The alloy contains from 48.75 to 50.75% silver, 20.25 to 21.75% copper, 28.25 to 29.25% tin, 0.05 to 0.8% palladium and up to 2.7% of elements selected from the group consisting of zinc, indium, manganese, cadmium, aluminum, gallium, ruthenium and mercury.
    Type: Grant
    Filed: December 2, 1991
    Date of Patent: February 9, 1993
    Assignee: Special Metals Corporation
    Inventors: Susan L. Smith, Richard W. Fountain
  • Patent number: 5171643
    Abstract: An electric contact material comprising 0.01 to 2.0 weight % of Li, 0.01 weight % or more to less than 0.2 weight % of at least one rare earth metal and the remainder being Ag. The electric contact material may further comprise 0.1 to 1.0 weight % of at least one element selected from a group consisting of In, Sn, Zn, Mn, Pd, Sb, Cu, Mg, Pb, Cd, Cr and Bi, however, for Zn and Mn, the amount is less than 0.5 % by weight; and/or 0.03 to 0.6 weight % of at least one element selected from a group consisting of Fe, Ni and Co. The electric contact material is excellent in arc resistance, wear resistance and lubricity in a small current region and is suitable as a material for a slide contact and a rotary slide contact.
    Type: Grant
    Filed: July 23, 1990
    Date of Patent: December 15, 1992
    Assignees: The Furukawa Electric Co., Ltd., Mabuchi Motor Kabushiki Kaisha
    Inventors: Satoshi Suzuki, Nobuyuki Shibata, Ryotomo Shirakawa, Akira Matsuda
  • Patent number: 5045411
    Abstract: A gold based alloy containing gold, silver, copper, zinc, silicon, iron, boron, nickel and indium for the manufacture of gold articles is described which has a lower melting point, extended remelting capabilities, high resistance to cracking, improved color consistency and increased ductility.
    Type: Grant
    Filed: January 10, 1990
    Date of Patent: September 3, 1991
    Assignee: P.M. Refining, Inc.
    Inventors: Arthur D. Taylor, Malcolm Warren, Perry H. Berger
  • Patent number: 5039479
    Abstract: A silver alloy composition exhibiting the desirable properties of reduced fire scale, reduced porosity, reduced grain size and reduced oxide formation when heated, consists essentially of the following parts by weight: about 89-93.5% silver, about 0.02-2% silicon, about 0.001-2% boron, about 0.5-5% zinc, about 0.5-6% copper, about 0.25-6% tin, and about 0.01-1.25% indium. A master alloy composition adapted to be alloyed with silver, consisting essentially of the following parts by weight: about 5-35% zinc, about 5-80% tin, about 5-35% copper, about 0.05-14% silicon, about 0.01-1.25% indium, and about 0.05-17% boron.
    Type: Grant
    Filed: September 5, 1990
    Date of Patent: August 13, 1991
    Assignee: United Precious Metal Refining Co., Inc.
    Inventors: Melvin Bernhard, James T. Sivertsen
  • Patent number: 5021214
    Abstract: Ag allow generally used for decorative purposes such as silverware and accessories, including In and Al as a substitute for conventionally used Pd provides the products with high discoloration resistance and elegant tint inherent to Ag. Additional content of Cu further improves mechanical properties of the products.
    Type: Grant
    Filed: December 26, 1989
    Date of Patent: June 4, 1991
    Assignee: Kabushiki Kaisha Zero One
    Inventors: Hiroshi Sasaki, Makoto Nishiya
  • Patent number: 4973446
    Abstract: An improved sterling silver alloy composition, exhibiting the desirable properties of reduced fire scale, reduced porosity and reduced grain size, consists essentially of the following parts by weight: about 92.5% silver, about 0.5% copper, about 4.25% zinc, about 0.02% indium, about 0.48% tin, about 1.25% of a boron-copper alloy containing about 2% boron and about 98% copper, and about 1% of a silicon-copper alloy containing about 10% silicon and about 90% copper.
    Type: Grant
    Filed: June 7, 1990
    Date of Patent: November 27, 1990
    Assignee: United Precious Metal Refining Co., Inc.
    Inventors: Melvin Bernhard, James T. Sivertsen
  • Patent number: 4859240
    Abstract: The present invention relates to a dental amalgam alloy comprising by weight, as alloying ingredients, from about 30 to 70% silver, from about 20 to 35% tin, from about 10 to 30% cooper, from 0 to about 5% indium, from 0 to about 1% zinc and from about 0.01 to 2% of a Group VIII metal selected from the group consisting of platinum, rhodium, iridium and ruthenium.
    Type: Grant
    Filed: June 5, 1987
    Date of Patent: August 22, 1989
    Assignee: Jeffery James Cheetham
    Inventor: Graham J. Parker
  • Patent number: 4842955
    Abstract: A brazing foil is composed of metastable material having a microcrystalline structure and a composition consisting essentially of about 15 to 40 weight percent copper, 0 to 32 weight percent zinc, 0 to 24 weight percent cadmium, 0 to 3 weight percent nickel and 0 to 10 weight percent tin, the balance being silver and incidental impurities. The foil is clean, homogeneous, brittle and is especially adapted for comminution into powder.
    Type: Grant
    Filed: September 14, 1987
    Date of Patent: June 27, 1989
    Assignee: Allied-Signal Inc.
    Inventor: Anatol Rabinkin
  • Patent number: 4810308
    Abstract: A unique hardenable silver alloy is provided which is solution annealed and preferably age-hardened to yield a silver alloy of exceptional and reversible hardness. The alloys utilize intermetallic systems comprising silver, copper, combined with lithium alone or tin alone in varying percent amounts, or silver, copper, lithium and either tin or antimony, or silver, copper, lithium and either aluminum or indium or zinc, or silver, copper, antiomony and either aluminum or indium or zinc, or silver, copper, lithium, tin and antimony, or silver, copper, lithium, tin and bismuth, or silver, copper, lithium, tin, bismuth and antimony.
    Type: Grant
    Filed: January 19, 1988
    Date of Patent: March 7, 1989
    Assignee: Leach & Garner Company
    Inventors: Thomas W. Eagar, Dwarika P. Agarwal, Laura L. Bourguignon, Rosaire Marcotte
  • Patent number: 4686082
    Abstract: The present disclosure relates to a dental amalgam alloy comprising by weight, as alloying ingredients, from about 30 to 70% silver, from about 20 to 35% tin, from about 10 to 30% copper, from 0 to about 5% indium, from 0 to about 1% zinc and from about 0.01 to 2% of a Group VIII metal selected from the group consisting of platinum, rhodium, iridium and ruthenium.
    Type: Grant
    Filed: July 2, 1984
    Date of Patent: August 11, 1987
    Assignee: Jeffery J. Cheetham
    Inventor: Graham J. Parker
  • Patent number: 4664629
    Abstract: By the present invention a dental alloy mixture is provided that is a combination of 20 to 70 percent by weight of cut alloy comprising silver, tin, and copper, with the copper present in an amount of 0 to 30 percent by weight of the cut alloy; and 30 to 80 percent by weight of spherical alloy comprising silver and cooper.
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: May 12, 1987
    Assignee: Dentsply Research & Development Corp.
    Inventor: Michael R. Chodkowski, deceased
  • Patent number: 4528034
    Abstract: Selenium-containing amalgam alloys for dental restoration comprises 0.1-50% by weight of any one of the following alloy powders (A), (B) and (C) mixed with 50-99.9% by weight of the following amalgam alloy powders (D).(A): Silver alloy powders containing no less than 50% by weight of silver and 0.01-10% by weight of selenium,(B): Copper alloy powders containing no less than 50% by weight of copper and 0.01-5% by weight of selenium,(C): Alloy powders mix of (A) with (B) wherein the total amount of silver and copper is adjusted to no less than 50% by weight, and the amount of selenium to 0.01-10% by weight, and(D): Silver-tin-copper amalgam alloy powders. At least one of the any one of (A), (B) and (C) and (D) may be pre-amalgamated with mercury in an amount of no higher than 3% by weight based on the total weight thereof.
    Type: Grant
    Filed: March 24, 1983
    Date of Patent: July 9, 1985
    Assignees: Atsushige Sato, Ishi Miura, G-C Dental Industrial Corp.
    Inventors: Atsushige Sato, Ishi Miura, Yasuhiro Kumei, Osamu Okuno, Tsuyoshi Nakano, Bunsaku Yoshida
  • Patent number: 4462841
    Abstract: A silver-metal oxides alloy electrical contact material that is highly resistant to sticking and arc-wear is disclosed. The contact material is made by internally oxidizing an alloy consisting essentially of 3-9 wt. % Sn, 1-3 wt. % In, 0.2-3.0 wt. % Cd, 0.05-1 wt. % Ni, 0.3-0.8 wt. % Cu, the balance being Ag and incidental impurities.
    Type: Grant
    Filed: April 19, 1983
    Date of Patent: July 31, 1984
    Assignee: Mitsubishi Kinzoku Kabushiki Kaisha
    Inventor: Yukiei Miyakawa
  • Patent number: 4453977
    Abstract: Conventional or non-conventional dental amalgam alloys in the form of lathe-cut, spherical shaped or irregular shaped particles of silver, tin, copper and zinc are improved by adding to the alloys at least one compound selected from Cu.sub.6 Sn.sub.5, Cu.sub.3 Sn or a mixture thereof. The resulting dental alloy mixture is low in silver, is corrosion resistant, and is used as a filling for dental cavities after amalgamation with mercury.
    Type: Grant
    Filed: June 15, 1982
    Date of Patent: June 12, 1984
    Assignee: Pennwalt Corporation
    Inventors: Charles F. Burns, Edward J. Pilcicki
  • Patent number: 4427628
    Abstract: The present invention relates to low in silver particulate dental amalgam alloys comprising by weight from about 46 to 48% silver, about 23 to 33% tin, about 20 to 28% copper and about 0.5 to 5% indium.The dental amalgam alloys of the present invention have been found to be particularly efficacious when incorporated in blends with high silver particulate dental amalgam alloys, said high silver alloys being used in amounts between about 30% and 70% of the total alloy blend.
    Type: Grant
    Filed: October 19, 1981
    Date of Patent: January 24, 1984
    Inventor: Jeffery J. Cheetham
  • Patent number: 4409181
    Abstract: A composition is provided consisting essentially of from about 50% to about 99% by weight of a silver-copper based brazing alloy and as an additive, from about 1% to about 50% to the composition, of a metal or metal alloy having essentially the same density as the brazing alloy and being essentially insoluble in the brazing alloy. The additives are selected from (a) molybdenum, (b) mixtures of molybdenum and at least one metal selected from the group consisting of cobalt, iron and tungsten and (c) mixtures of tungsen and at least one metal selected from iron and cobalt.
    Type: Grant
    Filed: August 24, 1981
    Date of Patent: October 11, 1983
    Assignee: GTE Products Corporation
    Inventor: Brian C. Coad
  • Patent number: 4385892
    Abstract: A novel setting composition for dental purposes comprises a dental silver amalgam alloy composed mainly of silver and tin, and including one or more of copper, zinc, indium, palladium and gold; mercury in an amount sufficient to amalgamate said alloy: and selenium. The selenium may or may not be coated with a metal showing an affinity for mercury, such as silver. The amount of selenium contained is in a range of 0.005 to 5% by weight.
    Type: Grant
    Filed: March 9, 1982
    Date of Patent: May 31, 1983
    Assignees: Atsushige Sato, Ishi Miura, G-C Dental Industrial Corp.
    Inventors: Atsushige Sato, Ishi Miura, Yasuhiro Kumei, Osamu Okuno, Bunsaku Yoshida