Corning Incorporated

Corning Glass Works

Gerald J Fine

Margaret E Greene

A family of lanthana borate glasses modified by iron oxide to become semiconducting. The glasses resist devitrification, exhibit bulk resistivities in the range of 10.sup.8 -10.sup.12 ohms-cm and possess other properties to make them particularly suitable for use in producing perforated plates for such applications as multichannel plates. The glass consist essentially of 40-55% by weight La.sub.2 O.sub.3, 25-40% B.sub.2 O.sub.3 and 10-30% Fe.sub.2 O.sub.3.

Semiconducting glass and article

This invention is directed to the formation of transparent, surface-crystallized glass bodies exhibiting very high mechanical strengths, but low frangibility, consisting essentially, in weight percent, of 2.5-5.0% Li.sub.2 O, 5-10% MgO, 3.5-12%, ZnO, 16-28% Al.sub.2 O.sub.3, and 50-70% SiO.sub.2.

Strong, surface crystallized glass articles

There is disclosed a family of alkali-free, lead silicate glasses having properties that make them particularly suitable for use in producing perforated plates for such applications as multichannel plates. In addition to lead oxide and silica, the glasses contain ZnO, BaO, CaO and, under certain circumstances, MgO.

Alkali-free multichannel plate and glass

There are disclosed fluoroborosilicate glasses that are particularly adapted to being drawn with lead silicate core glasses to produce clad glass fibers useful in forming fiber optic bundles to be incorporated in night vision equipment. The cladding glass has a refractive index not over about 1.465 and a coefficient of thermal expansion not over about 80.times.10.sup.-7 /.degree.C. The clad fiber has a numerical aperture approximating or equal to one.

Fluoroborosilicate glass and clad article

Ultraviolet transmitting glasses exhibiting coefficients of thermal expansion between 46-52.times.10.sup.-7 /.degree.C. and transmittances at a thickness of 1 mm of at least 80% at a wavelength of 254 nm which are essentially free of fluoride and consist essentially, in mole percent, of 60-70% SiO.sub.2, 16-20% B.sub.2 O.sub.3, 1-8% Al.sub.2 O.sub.3, 1-6% Li.sub.2 O, 2.5-5% N.sub.2 O, 0-3% K.sub.2 O, and 0-1.25% Cl, w9herein the mole ratio R.sub.2 O:R.sub.2 O.sub.3 is greater than 0.3, but less than 0.5.

Ultraviolet transmitting glasses for EPROM windows

Ultraviolet transmitting glasses exhibiting coefficients of thermal expansion between 46-52.times.10.sup.-7 /.degree. C. and transmittances at a thickness of 1 mm of at least 80% at a wavelength of 254 nm which are essentially free of fluoride and consist essentially, in mole percent, of 60-70% SiO.sub.2, 16-20% B.sub.2 O.sub.3, 1-8% Al.sub.2 O.sub.3, 1-6% Li.sub.2 O, 2.5-5% N.sub.2 O, 0-3% K.sub.2 O, and 0-25% Cl, wherein the mole ratio R.sub.2 O:R.sub.2 O.sub.3 is greater than 0.3, but less than 0.5.

There are disclosed fluoroborosilicate glasses that are particularly adapted to being drawn with lead silicate core glasses to produce clad glass fibers useful in forming fiber optic bundles to be incorporated in night vision equipment. The cladding glass has a refractive index not over about 1.45 and a coefficient of thermal expansion not over about 120.times.10.sup.-7 /.degree.C. The clad fiber has a numerical aperture approximating or equal to one.

Fluoroborosilicate glass clad article and night vision device

Fluoroborosilicate glass

Alkali boroaluminosilicate glasses exhibiting moderately high thermal expansion coefficients, good melting characteristics, and a UV transmittance of at least 80% in 1 mm thickness at a wavelength of 254 nm are described, such glasses consisting essentially of about 58-62%, SiO.sub.2, 15-18% B.sub.2 O.sub.3, 11.5-14.5% Al.sub.2 O.sub.3, 1-2.5% Li.sub.2 O, 5.5-6.5% Na.sub.2 O, 0-2% K.sub.2 O, and 0-0.6% Cl.

Growing community of inventors

Corning, NY, United States of America

Gerald J Fine