Abstract: Glass having an optimized degree of cross-linking of the phosphate component in the glass matrix is provided so that excellent weatherability is achieved. These glasses are fluorophosphate glasses that contain copper oxide as coloring component. The glasses can further contain coloring components and are obtainable in a method that includes a bubbling step.

Abstract: Provided is a low-dispersion optical glass that is formed of a fluorophosphate glass in which the molar ratio of the content of O2? to the content of P5+, O2?/P5+, is 3.5 or more and that has an Abbe's number (?d) of over 70 or has an F? content of 65 anionic % or more, and the optical glass enables the suppression of the volatilization of a glass component when an optical glass formed of a fluorophosphate glass is produced or when an obtained glass in a molten state is caused to flow out to shape it into a glass shaped material, so that the variation of properties such as a refractive index, etc., involved in the fluctuations of a glass composition and the variation of quality such as the occurrence of striae can be suppressed.

Abstract: The present invention provides a process for producing a near infrared cut filter glass by melting and forming a glass material blended; and from 0.1 to 5% as represented by mass percentage of an oxidant of at least of a nitrate compound, a sulfate compound, a peroxide, a perchlorate and chloric acid as well as a near infrared cut filter glass.

Abstract: Provided is a low-dispersion optical glass that is formed of a fluorophosphate glass in which the molar ratio of the content of O2? to the content of P5+, O2?/P5+, is 3.5 or more and that has an Abbe's number (?d) of over 70 or has an F? content of 65 anionic % or more, and the optical glass enables the suppression of the volatilization of a glass component when an optical glass formed of a fluorophosphate glass is produced or when an obtained glass in a molten state is caused to flow out to shape it into a glass shaped material, so that the variation of properties such as a refractive index, etc., involved in the fluctuations of a glass composition and the variation of quality such as the occurrence of striae can be suppressed.

Abstract: The present invention relates to an optical glass with a high refractive index and good precision press moldability, and a preform for precision press molding and an optical element that are comprised of the optical glass. The present invention further relates to a method of manufacturing an optical element, a lens unit being equipped with an optical element and an image pickup device being equipped with a lens unit.

Abstract: Provided is an optically uniform and high-quality optical glass that is free from the occurrence of striae when a precision press-molding preform is produced therefrom, and that is a fluorine-containing glass having a refractive index nd(1) wherein the refractive index nd(1) and a refractive index nd(2) are substantially equivalent to each other, said refractive index nd(2) being a refractive index of the fluorine-containing glass after the fluorine-containing glass is re-melted in a nitrogen atmosphere at 900° C. for 1 hour, cooled to its glass transition temperature and then cooled to 25° C. at a temperature decrease rate of 30° C./hour.

Abstract: Provided is an optically uniform and high-quality optical glass that is free from the occurrence of striae when a precision press-molding preform is produced therefrom, and that is a fluorine-containing glass having a refractive index nd(1) wherein the refractive index nd(1) and a refractive index nd(2) are substantially equivalent to each other, said refractive index nd(2) being a refractive index of the fluorine-containing glass after the fluorine-containing glass is re-melted in a nitrogen atmosphere at 900° C. for 1 hour, cooled to its glass transition temperature and then cooled to 25° C. at a temperature decrease rate of 30° C./hour.

Abstract: Disclosed are the use of phosphate-based glasses as a solid state laser gain medium, in particular, the invention relates to broadening the emission bandwidth of rare earth ions used as lasing ions in a phosphate-based glass composition, where the broadening of the emission bandwidth is believed to be achieved by the hybridization of the glass network.

Abstract: An optical glass having high refractive index and low dispersion properties. There is provided an optical glass having an Abbe number (?d) and a refractive index (nd) in a region indicated by a shape bound by connecting three points, A(53, 1.70), B(53, 1.87), and C(40, 1.87) with straight lines on an orthogonal xy-coordinate system with the x-axis designating the Abbe number and the y-axis designating the refractive index; and comprising no less than 25% and no more than 65% of a combination of a SiO2 component and a B2O3 component, no less than 20% and no more than 55% of a Ln2O3 component (Ln represents at least one species selected from the group consisting of La, Gd, Dy, Yb, and Lu), and a ratio of a La2O3 component to a Ln2O3 component being no more than 0.6, by mol % on the basis of oxides.

Abstract: Methods of melt spinning to make amorphous and ceramic materials.

Abstract: The present invention relates to an optical glass with a high refractive index and good precision press moldability, and a preform for precision press molding and an optical element that are comprised of the optical glass. The present invention further relates to a method of manufacturing an optical element, a lens unit being equipped with an optical element and an image pickup device being equipped with a lens unit.

Abstract: The optical glass has a refractive index nd of 1.945?nd?1.97, an Abbe number ?d of 33??d?36, and a composition with the following components in amounts expressed in % of their cations, with respect to the total number of cations in the composition: B3+, 35-46; La3+, 25-35; Ta5+, 6-14; W6+, 6-13; Zr4+, 1-7; Gd3+, 0-5; Nb5+, 0-4; Y+3, 0-4; Ba2+, 0-2; ? alkaline earth metal cations, 0-2, ? La3++Ta3++W6++Zr4++Gd3++Nb5++Y3+?50; and at least one fining agent, 0-0.3. Also a ratio of B3+ to La+3 is 1.1 to 1.6 and a ratio of B3+ to ? Si+4+B3+ is ?0.5. The glass is free of lead, arsenic, Ti4+, Th4+, Zn2+, F?, and Hf+4.

Abstract: Di-ammonium phosphate, murate of potash and gypsum are the conventional phosphorous, potassium and sulfur fertilizers respectively. Application of gypsum to soil can cause an increase calcium load on soil and polluted surface and underground water. The most successful technique is application of phosphorous-potassium-sulfur glass which can be added directly to the soil. Main feature of the present invention is formulation and making of a composition of high phosphorous, potassium and sulfur containing glass free from alkali like Na2O, Li2O and ZnO, which are toxic to the plants. Such glasses are capable of slow release of phosphorous, potassium and sulfur required in the area of agriculture, fungicide, pesticide and weedicides etc. The present invention also emphasize optimization of nutrient content, reduction of calcium load on the soil, minimization of surface and under-ground water pollution and maintenance of acidic environment near the plant roots in the soil.

Abstract: Starting from an optical component of quartz glass for transmitting ultraviolet radiation of a wavelength between 190 nm and 250 nm, with a glass structure essentially without oxygen defects, a hydrogen content ranging from 0.1×1016 molecules/cm3 to 5.0×1016 molecules/cm3, and with a content of SiH groups of less than 5×1016 molecules/cm3, to provide such a component which is particularly well suited for use with linearly polarized UV laser radiation, the present invention suggests that the component should have a content of hydroxyl groups ranging from 10 to 250 wt ppm and a fictive temperature above 1000° C.

Abstract: An optical glass consisting essentially of B2O3 in an amount of 10-40 wt %, SiO2 in an amount less than or equal to 5 wt %, ZnO in an amount less than or equal to 15 wt %, SrO in an amount less than or equal to 9 wt %, ZrO2 in an amount less than or equal to 9 wt %, La2O3 in an amount of 15 to 45 wt %, BaF2 in an amount of 1 to 10 wt %, BaO in an amount less than or equal to 5 wt %, HfO2 in an amount of 0.1 to 7.5 wt %, Gd2O3 in an amount less than or equal to 16 wt %, CaO in an amount less than or equal to 7 wt %, ZrF4 in an amount less than or equal to 5 wt %, Na2O in an amount less than or equal to 2 wt % and Y2O3 in an amount less than or equal to 16 wt %. The optical glass has a glass transition temperature in a range of 500-670° C. and a refractive index (nd) in a range of 1.60 to 2.00.

Abstract: The present invention provides a blue-violet light blocking glass containing copper (I) halide fine particles that satisfactorily transmits light having a wavelength of 450 nm to 600 nm and sharply blocks light having a wavelength shorter than 450 nm. Specifically, the present invention provides a blue-violet light blocking glass containing a copper (I) halide and silver; for example, 20 to 85% by weight of SiO2; 2 to 75% by weight of B2O3; not more than 10% by weight of Al2O3; 2 to 30% by weight of at least one member selected from the group consisting of Li2O, Na2O, K2O, Rb2O and Cs2O; 1 to 15% by weight of at least one member selected from the group consisting of MgO, CaO, SrO, BaO and ZnO; not more than 10% by weight of at least one member selected from the group consisting of PbO, Nb2O5, ZrO2, La2O3, Y2O3, Ta2O3 and Gd2O3; not more than 5% by weight of at least one member selected from the group consisting of Sb2O3 and As2O3; not more than 5% by weight of SnO2; 0.

Abstract: The invention relates to vitreous compositions, in particular of the vitroceramic type, transparent to infrared, production and uses thereof. Said compositions comprise in mol. %: Ge 5-40, Ga<1, S+Se 40-85, Sb+As 4-40, MX 2-25, Ln 0-6, adjuncts 0-30, where M=at least one alkaline metal, selected from Rb, Cs, Na, K and Zn, X=at least one atom of chlorine, bromine or iodine, Ln=at least one rare earth and adjunct=at least one additive comprising at least one metal and/or at least one metal salt with the sum of all molar percentages of the components present in said composition being 100.

Abstract: A glass composition of the present invention is manufactured by melting glass raw materials and contains a multicomponent oxide as a main component, and the glass composition contains at least one of helium and neon in an amount of 0.01 to 2 ?L/g (0° C. 1 atm).

Abstract: The invention relates to uses of glasses and glass-ceramics in dental and orthodontic applications.

Abstract: A method for producing a component from a glass/polymer mixture where, a component is formed from a mixture of a thermoplastic with a processing temperature T1 and first glass particles with saturated surface bonds and a glass temperature T2<T1, at a temperature T3>T1. By melting the first glass particles, second glass particles are produced with surface bonds which can be saturated. The bonds are saturated by being bonded to the thermoplastic.

Abstract: A new and improved hybrid of Ga:La:S (GLS) glass is provided, namely a glass comprising gallium sulfide, lanthanum oxide, and at least 2 mol % lanthanum fluoride. The Ga:La:S:O:F (GLSOF) glass retains the important properties of the Ga:La:S system, while introducing improved thermal stability and spectroscopic properties. In addition, GLSOF glasses are non-toxic. The glass formation region for GLSOF has been carefully evaluated with compositional variations. It has been identified that an area of glass formation as indicated by circles, is a new and previously undiscovered glass formation region.

Abstract: Maximizing the glass forming ability of low metal-phosphate content fluoride-based glasses allows the fabrication of large-size “crystal-free” HEL windows. This involves the addition of glass stabilizer oxides such as SiO2, TiO2, Al2O3. In situ quenching is used to fabricate large-scale HEL windows substantially free of crystals, bubbles and striation.

Abstract: A glass composition for a seal consists essentially of 70-75 wt % of PbO, 3-7 wt % of PbF2, 5-8 wt % of Bi2O3, 5-7 wt % of B203, 2-5 wt % of ZnO, 1-3 wt % of Fe2O3, 0-2 wt % of CuO, 0-2% of TeO2, and a trace <0.2% of MnO2, the composition having a flow temperature of <350° C. Such seals can be flowed at low temperatures, using different and less environmentally damaging constituents to those used before. Damage to temperature sensitive materials near the seals, can be reduced. Low flow temperatures can be achieved without excessive degradation of properties such as low viscosity, low expansion coefficient, good adhesion to glass and metals, low permeability of air, good long term hydrolytic stability. A filler such as a ceramic powder, is added to match the temperature expansion coefficient to the materials being sealed. It can be used to fix silica fiber into electro-optic devices to achieve hermetic joints with high mechanical stability.

Abstract: A family of tellurite glasses and optical components for telecommunication systems, the glasses consisting essentially of, as calculated in cation percent, 65-97% TeO2, and at least one additional oxide of an element having a valence greater than two and selected from the group consisting of Ta, Nb, W, Ti, La, Zr, Hf, Y, Gd, Lu, Sc, Al and Ga, that may contain a lanthanide oxide as a dopant, in particular erbium oxide, and that, when so doped, is characterized by a fluorescent emission spectrum having a relatively broad FWHM value.

Abstract: A glass includes (a) a matrix containing a compound of at least one nonmetallic element; and (b) a particle selectively formed in the matrix. This particle is made of the at least one nonmetallic element. A process for producing such glass includes (a) providing a blank glass containing a compound of at least one nonmetallic element; (b) condensing a pulsed laser beam to a focal point in the blank glass such that a particle is selectively formed in the blank glass at a position corresponding to the focal point, the particle being made of the at least one nonmetallic element dissociated from the compound; and (c) moving the focal point in the blank glass to produce a pattern of the particle. The glass is suitable for optical functional elements.

Abstract: A Tm-doped germanate glass composition comprises GeO2 having a concentration of at least 20 mole percent, Tm2O3 having a concentration of about 0.001 mole percent to about 2 mole percent, and Ga2O3, having a concentration of about 2 mole percent to about 40 mole percent. The composition can further include an alkaline earth metal compound selected from the group consisting of MgO, CaO, SrO, BaO, BaF2, MgF2, CaF2, SrF2, BaCl2, MgCl2, CaCl2, SrCl2, BaBr2, MgBr2, CaBr2, SrBr2, and combinations thereof, and having a non-zero concentration of less than about 40 mole percent. The composition can further include an alkali metal compound selected from the group consisting of Li2O, Na2O, K2O, Rb2O, Cs2O, Li2F2, Na2F2, K2F2, Rb2F2, Cs2F2, Li2Cl2, Na2Cl2, K2Cl2, Rb2Cl2, Cs2Cl2, Li2Br2, Na2Br2, K2Br2, Rb2Br2, Cs2Br2 and combinations thereof, and having a non-zero concentration of less than about 20 mole percent.

Abstract: According to one aspect of the present invention an optically active glass contains Sb2O3, up to about 4 mole % of an oxide of a rare earth element, and 0-20 mole % of a metal halide selected from the group consisting of a metal fluoride, a metal bromide, a metal chloride, and mixtures thereof, wherein this metal is a trivalent metal, a divalent metal, a monovalent metal, and mixtures thereof. In addition, any of the glass compositions described herein may contain up to 15 mole % B2O3 substituted for an equivalent amount of Sb2O3.

Abstract: New and improved compositions of doped and co-doped germanium fluorophosphate glasses for laser hosts and fiber amplifiers have a high refractive index (nD) 1.67-1.70, high transmission in the near infrared part of the spectra (to 6 micron) and a wide glass-forming domain. These glass systems [BaGe4O9—Ba(PO3)2—RFx] contain (mol %): BaF2, CaF2, MgF2, BiF3, PbF2 of 10 to 70 percent and GeO2 7.31 to 58.48 percent, P2O5 of 4.81 to 38.50 percent, BaO of 7.86 to 62.94 percent where dopants and co-dopants are over 100 percent (in wt %): Nd2O3(NdF3) of 0.5 to 15 percent, Er2O3(ErF3) of 0.2 to 12 percent, Yb2O3(YbF3) of 1.0 to 15 percent, Ho2O3(HoF3) of 1.0 to 10 percent, Pr2O3(PrF3) of 0.5 to 12 percent, Tm2O3(TmF3) of 0.2 to 10 percent, Tb2O3(TbF3) of 0.1 to 10 percent, MnO(MnF2) of 0.5 to 20 percent.

Abstract: The present invention relates to an oxyhalide glass matrix including 0-70 mol. % SiO2, 5-35 mol. % Al2O3, 1-50 mol. % B2O3, 5-35 mol. % R2O, 0-12 wt. % F, 0-12 wt. % Cl, and 0 to 0.2 mol. % rare earth element, wherein R is Li, Na, K, Rb, or Cs. The present invention further relates to a method of producing the glass matrix and to a method of modifying the spectral properties of an oxyhalide glass.

Abstract: Glasses of the present invention are tellurite and oxyhalide glasses doped with rare-earth ion, which can be applied to highly efficient optical amplifiers and lasers for optical communication. They are thermally and chemically stable during and after the fabrication processes of the optical fiber. The glass material includes 20˜70 mole % of TeO2, a heavy metal oxide, 0.001˜10 mole % of a rare earth ion dopant, 5˜30 mole % of MO, M being selected from a group consisting of Mg, Ca, Sr, Ba, Zn and Pb, and optionally 1˜20 mole % of R2O, R being selected from a group consisting of Li, Na, K, Rb and Cs. In the composition of the glass, 3˜18 mole % of MO and R2O may be substituted by the metal halides. The glasses of the present invention are similar in phonon energy to the conventional tellurite glasses not to increase the non-radiative transition rate. Further, the fluorescence lifetime is additionally increased in case of partial substitution of oxide to halide.

Abstract: A family of tellurite glasses and optical components for telecommunication systems, the glasses consisting essentially of, as calculated in cation percent, 65-97% TeO2, and at least one additional oxide of an element having a valence greater than two and selected from the group consisting of Ta, Nb, W, Ti, La, Zr, Hf, Y, Gd, Lu, Sc, Al and Ga, that may contain a lanthanide oxide as a dopant, in particular erbium oxide, and that, when so doped, is characterized by a fluorescent emission spectrum having a relatively broad FWHM value.

Abstract: A glass consisting essentially of antimony oxide. An optically active glass consisting essentially of antimony oxide and up to about 4 mole % of an oxide of a rare earth element. A rare earth-doped, antimony oxide-containing glass including 0-99 mole % SiO2, 0-99 mole % GeO2, 0-75 mole % (Al, Ga)2O3, 0.5-99 mole % Sb2O3, and up to about 4 mole % of an oxide of a rare earth element. The oxide of the rare earth element may comprise Er2O3. The glass of the invention further includes fluorine, expressed as a metal fluoride. An optical energy-producing or light-amplifying device, in particular, an optical amplifier, comprising the above-described glass. The optical amplifier can be either a fiber amplifier or a planar amplifier, either of which may have a hybrid composition. Embodiments of the glass of the invention can be formed by conventional glass making techniques, while some of the high content antimony oxide embodiments are formed by splat or roller quenching.

Abstract: A family of alkali-tungsten-tellurite glasses that consist essentially of, as calculated in mole percent, 10-90% TeO2, at least 5% W03 and at least 0.5% R2O where R is Li, Na, K, Cs, Tl and mixtures, that may contain a lanthanide oxide as a dopant, in particular erbium oxide, and that, when so doped, is characterized by a fluorescent emission spectrum having a relatively broad FWHM value.

Abstract: A family of fluorotellurite glasses, the composition of which consist essentially of, as calculated in mole percent, 30-75% TeO2, 15-60% ZnF2 and 0.005-10% of an oxide of erbium, thulium or holmium, and amplifying optical components produced from these glasses.

Abstract: A glass includes (a) a matrix containing a compound of at least one nonmetallic element; and (b) a particle selectively formed in the matrix. This particle is made of the at least one nonmetallic element. A process for producing such glass includes (a) providing a blank glass containing a compound of at least one nonmetallic element; (b) condensing a pulsed laser beam to a focal point in the blank glass such that a particle is selectively formed in the blank glass at a position corresponding to the focal point, the particle being made of the at least one nonmetallic element dissociated from the compound; and (c) moving the focal point in the blank glass to produce a pattern of the particle. The glass is suitable for optical functional elements.

Abstract: The present invention relates to a sealing glass composition, which is able to seal a panel and funnel of a color TV at low temperature for a short time by adding Garnet(Fe.sub.3 Al.sub.2 Si.sub.3 O.sub.12) as a nucleating agent and filler component to control the thermal expansion coefficient.

Abstract: These glasses incorporate a combination of F and Al.sub.2 O.sub.3 to achieve even wider fluorescence and improved gain flatness. In addition, SPCVD incorporates large amounts of N into low-loss fiber whose high charge has an impact on rare earth behavior. The Surface Plasma Chemical Vapor Deposition (SPCVD) produces fiber preforms with high levels of F, Al.sub.2 O.sub.3, and N. These heavily fluorinated glasses provide much broader Er.sup.3+ emission than Type I or Type II silica for enhanced multichannel amplifiers. SPCVD successfully fluorinates silica with losses below 5 dB/km and increased Er.sup.3+ emission width.

Abstract: A transparent class ceramic composition includes an oxide component, a rare earth component, a halide component, and a substantially pure rare earth-halide (e.g., REF.sub.3) crystal component. A method for making a transparent oxyfluoride glass includes preparing an oxyfluoride glass containing rare earth ions by a conventional melting method and subjecting the glass to a heat treatment thereby precipitating fluoride fine crystals containing a large amount of rare earth ions.

Abstract: This patent discloses the composition of germanate glass and a new method for its fabrication. The composition comprises germanate, the oxide of an alkali earth group, Al.sub.2 O.sub.3, ZnO, a halides compound eg. CaF.sub.2, CaCl.sub.2 and so on,, and can combine with a series of oxygenous compounds such as silicate, borate, phosphate, arsenate, tellurate and so on, if required. The addition of an alkali oxide could increase the glass formation rate and homogeneity, and the defects of devitrification, cord, knot, and blister are reduced. Its fabricated methods which consist of the reduction pressure melting with the addition of a halide and the drying procedure. The germanate glass body that is made is colorless and transparent and it can increase the transmittance of infrared from 20% to greater than 60% in the wave length 2.75-3.0 .mu.m. The price of producing the germanate glass is decreased and the transmittance of this composition system increased from 5% to 80%.

Abstract: Vitrified phosphor articles, intermediates, and methods for preparing the articles. In the methods, a combination of species are admixed. The combination of species are precursors for a glass-forming system. The glass-forming system includes precursors for a crystalline radiographic phosphor. The admixed combination of species are fired to form a melt having a single liquid. The product of the melt is molten-shaped.

Abstract: Halide glasses having particular utility as hosts for praseodynmium in order to provide optical amplification by laser activity have a halide content provided as a small proportion, e.g., 1-10 percent, of choride with the remainder as fluoride. The metal content is similar to conventional ZBLAN glasses. The replacement of A1 by Y and In and/or the partial replacement of Na by Cs has synergistic benefits. PR.sup.3+ constitutes a good lasing species for amplifying telecommunication signals at 1300 nm using pumped radiation at 1020 nm.

Abstract: A surface-reduced photochromic glass containing silver halide crystals, having an original transmittance of 60-75%, a darkened transmittance of less than 30% at 25.degree. C., a faded transmittance equal to the darkened transmittance plus at least 25% and a value of at least 50%, a position in a color mixture diagram between 575 and 585 nm, the glass composition having a Na.sub.2 O content of at least 1% in its surface, or containing as additives 1-6 ppm Pd, or a combination of 2-10 ppm Au and up to 0.9% Er.sub.2 O.sub.3. The glass may be chemically strengthened and generally has a longer dominant wavelength when so treated.

Abstract: A Faraday rotator glass composition based on a fluoride glass, phosphate glass, fluorophosphate glass or a mixture thereof is doped with a lanthanide in a concentration sufficient to provide a Verdet constant above at least 2870 deg/Tesla-meter [(1 min/cm-Oe).times.(1.667.times.10.sup.4)=1 deg/Tesla-meter] and optical transmission above at least 50 percent in a 25 mm thick polished glass sample at least at one wavelength in the 200 to 400 nm wavelength region. The Faraday rotator glass also includes monovalent non-lanthanide cations such as Na, Li, K or mixtures thereof in a concentration sufficient to provide a Verdet constant above at least 2870 deg/Tesla-meter and optical transmission above at least 50 percent in a 25 mm thick polished glass sample at least at one wavelength in the 200 to 400 nm wavelength region.

Abstract: A low temperature sealing glass composition suitable for sealing integrated circuit alumina packages at temperatures below 400.degree. C. in a short time of about ten minutes. This sealing glass composition is a mixture of a glass powder and 1 to 50% (by weight) of one or more low expansion ceramic powders. The glass powder comprises a lead borate or lead zinc borate glass and the joint addition of Cu.sub.2 O, Tl.sub.2 O and F in a range of 6.3 to 20% (by weight) wherein the molar ratio of Cu to Tl to F is in the range between 0.8 Cu: 0.8 Tl: 0.8 F to 1.2 Cu: 1.2 Tl: 1.2 F. The glass in powder form is blended with one or more compatible low expansion ceramic powders including cordierite, zircon, willemite, lead titanate or modified tin oxide.

Abstract: Optical parts and optical equipment, including lenses, mirrors and laser media made of athermal glasses having compositions comprising 0-13 mol % CdO, 9-24 mol % CdF.sub.2, 5-10 mol % LiF, 30-34.5 mol % AlF.sub.3 28-33.5 mol % PbF.sub.2, 0-4 mol % KF, 0-6.5 mol % YF.sub.3, and 0-2 mol % LaF.sub.3 and having little or no optical path length change as a function of temperature in the infrared region of 1.mu.m to 5.mu.m.

Abstract: This invention is directed towards the production of a bioabsorbable glass-polymer alloy comprising a bioabsorbable glass and a bioabsorbable polymer, said glass having a working temperature below about 350.degree. C., a transition temperature no higher than about 250.degree. C., and which exhibits a dissolution weight loss rate which is similar to the rate at which a bioabsorbable polymer is absorbed by the body. Such exemplary bioabsorbable polymers include poly(lactic) acid, poly(glycolic) acid, poly(dioxanone), polyethylene terephthalate, polyethylene oxide poly(caprolactone), copolymers of lactic acid and glycolic acid, and mixtures thereof.The glass disclosed herein consists essentially, expressed in terms of weight percent on the oxide basis, of at least 85% total of 30-55% P.sub.2 O.sub.5, 12-35% ZnO, 10-30% Cl, and 15-40% R.sub.2 O, wherein R.sub.2 O consists of at least one alkali metal oxide in the indicated proportions selected from the group consisting 5-25% Na.sub.2 O, 0-25% K.sub.

Abstract: A magnetic head comprising magnetic core halves which are sealed with a sealing glass which consists essentially of 1 to 75 wt. % of TeO.sub.2, 1 to 30 wt. % of B.sub.2 O.sub.3, 1 to 75 wt. % of PbO, 1 to 25 wt. % of CdO, 0 to 15 wt. % of ZnO, 0 to 25 wt. % of Bi.sub.2 O.sub.3, 0 to 5 wt. % of A.sub.2 O wherein A is an alkali metal, 0 to 35 wt. % of ARO wherein AR is an alkaline earth metal, 0 to 35 wt. % of La.sub.2 O.sub.3, 0 to 5 wt. % of at least one oxide selected from the group consisting of Al.sub.2 O.sub.3, SiO.sub.2, TiO.sub.2 and ZrO.sub.2, 0 to 10 wt. % of at least one oxide selected from the group consisting of Ta.sub.2 O.sub.5, Nb.sub.2 O.sub.5, WO.sub.3 and MoO.sub.3, 0 to 30 wt. % of PbF.sub.2, and 0 to 2 wt. % of CoO, has a coefficient of thermal expansion of from 82.times.10.sup.-7 /.degree.C. to 137.times.10.sup.-7 /.degree.C. in a temperature range between 30.degree. C. and 300.degree. C., a working temperature of from 430.degree. to 620.degree. C.

Abstract: This invention is directed to glasses exhibiting annealing points above 625.degree. C., strain points above 600.degree. C., linear coefficients of thermal expansion (25.degree.-300.degree. C.) below 90.times.10.sup.-7 /.degree. C., refractive indices below 1.8, and, in thicknesses of 2 mm, infrared transmissions of at least 50% to wavelengths longer than 6 .mu.m, consisting essentially expressed in terms of cation % on the oxide basis, of 5-40% KO.sub.0.5, 4-22% LaO.sub.1.5, 50-76% GaO.sub.1.5, and up to 15% total of at least one additional component in the indicated properties selected from the group consisting of______________________________________ BaO 0-5 NaO.sub.0.5 0-5 CaO 0-5 PbO 0-5 CsO.sub.0.5 0-10 ZnO 0-5 ReO.sub.1.5 0-5 Cl 0-5.

Abstract: Low temperature sealing glass compositions comprising 35 to 80% by weight TeO.sub.2, 15 to 50% V.sub.2 O.sub.5 and 0.1 to 20% Nb.sub.2 O.sub.5, ZrO.sub.2 and/or ZnO.

Abstract: This invention relates to a glass exhibiting a transistion temperature no higher than 425.degree. C. and excellent resistance to attack by water consisting essentially, expressed in terms of weight percent on the oxide basis, of about:______________________________________ P.sub.2 O.sub.5 38-50 MoO.sub.3 0-10 Al.sub.2 O.sub.3 0-5 WO.sub.3 0-10 Na.sub.2 O 2-10 MoO.sub.3 + WO.sub.3 2-15 Li.sub.2 O 0.75-5 SnO.sub.2 0-10 K.sub.2 O 2-10 Cl 0-8 (analyzed) Na.sub.2 O + Li.sub.2 O + 5-25 Sn.sub.2 O + MoO.sub.3 + 2-25 K.sub.2 O WO.sub.3 + Cl ZnO 28-40 ______________________________________and being essentially free of PbO.