BACKGROUND OF THE INVENTION
This invention relates to novel semiconducting glasses and the method for their preparation.
Semiconducting elements have been found to have many and varied uses in a wide variety of arts. Included among these uses are the formation of resistive elements for electronic circuits, voltage stabilizers for use at high voltages, sensors for temperature measurement by means of electrical conductivity, and leakage resistors for electron microscopes. (more…)
What is claimed is:
1. A semiconducting glass composition consisting essentially of as given in weight percent:
with V.sub.2 O.sub.5 + MoO.sub.3 + P.sub.2 O.sub.5 being in the range of 70 to 90 weight percent, the glass being chemically stable and having a resistivity within the range of from about 2 .times. 10.sup.7 to about 6 .times. 10.sup.8 ohm.sup.. cm. (more…)
United States Patent 3,950,176 Deeg , et al. April 13, 1976
Chemically stable, semiconducting glasses having a resistivity of from about 2 .times. 10.sup.7 to about 6 .times. 10.sup.8 ohm.sup.. cm contain 25 to 35 weight percent of vanadium pentoxide, 10 to 20 weight percent phosphorous pentoxide, and from 35 to 45 weight percent of molybdenum trioxide. These semiconducting glasses are melted readily, are castable into desired shapes, and offer good resistance to devitrification.
Heat absorbing glasses
The heat screen in a slide projector, or other type of light image projection apparatus, is a glass element or lens designed to transmit light to the film and to protect the film from the intense heat generated by the projection lamp or other light source. Indeed, these lenses can reach temperatures of 430.degree.C. and higher during operation of the projection unit. Such elements have commonly been made from thermally tempered, heat absorbing glasses which demonstrate relatively good transmission to radiation having wave lengths within the visible portion of the spectrum. (more…)
Glasses Patent Description
BACKGROUND OF THE INVENTION
This invention is related to Faraday rotation glasses and is more particularly concerned with a new Faraday rotation glass which exhibits a high Verdet constant and low susceptibility toward devitrification. (more…)
Glasses Patent Claim
We claim:
1. A Faraday rotation glass exhibiting a high Verdet constant and low susceptibility toward devitrification consisting essentially of the following constituents as expressed in weight percent:
where the alkaline earth oxide is selected from the group consisting of CaO, BaO, ZnO, and combinations thereof, the rare earth oxide is selected from the group consisting of Tb.sub.4 O.sub.7, and the combination of Tb.sub.4 O.sub.7 and La.sub.2 O.sub.3, the Tb.sub.4 O.sub.7 being present in an amount of 20-45 weight percent, and the alkali metal oxide being selected from the group consisting of Na.sub.2 O, K.sub.2 O, and combinations thereof. (more…)
United States Patent 3,935,020
Deeg , et al. January 27, 1976
Glasses Patent Abstract
Faraday rotation glasses exhibiting a high Verdet constant and a low susceptability toward devitrification are formed by introducing a high quantity of rare earth oxides into a borate glass base. The glasses can be melted under standard environmental conditions and may be made on a large scale.
Glasse Parent Description
Glasses of the BaO — Nb.sub.2 O.sub.5 — GeO.sub.2, SrO — Nb.sub.2 O.sub.5 — GeO.sub.2 and PbO — Nb.sub.2 O.sub.5 — GeO.sub.2 system in selected proportions have been found to have desirable properties from the standpoint of transparency and stability and are useful for a wide variety of purposes. Of particular interest is the finding that these glasses can be heat treated to produce transparent glass-ceramics having an index of refraction higher than that of the glass and which specifically may be in excess of 2.000. The glass-ceramics which are capable of being formed from glasses within the above-described glass system have high dielectric constants; e.g. in excess of 50 and low dissipation factors; e.g. about 3.5% or less. Both transparent and non-transparent or opaque glass-ceramics may be obtained in accordance with this invention possessing the aforementioned desirable properties. (more…)
Glasse Parent Case Text
REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of copending application Ser. No. 349,152 filed Apr. 9, 1973 now abandoned; which in turn is a division of copending application Ser. No. 241,448 filed Apr. 5, 1972 now U.S. Pat. No. 3,852,077, the entire disclosures of both copending applications are relied on herein. (more…)
United States Patent 3935019
Rapp January 27, 1976
Glasses Patent Abstract
Thermally crystallizable glasses are disclosed of the system: wherein RO is a BaO or SrO. Also disclosed are thermally crystallizable glasses of the system PbO — Nb.sub.2 O.sub.5 — GeO.sub.2. Glass-ceramics made from these glass systems have high dielectric constants and low dissipation factors or loss tangents, which glasses and glass-ceramics are suitable for use as capacitors and dielectrics, and particularly for thick-film dielectric pastes utilized in the manufacture of micro-electronic printed circuits. (more…)