US3837868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized bismuthate glasses
Assignee: Corning Glass Works
•
Filing: 1973-03-26
•
Granted: 1974-09-24
•
Expires: 1993-03-26
Abstract
Abstract Iron oxide is used to stabilize infrared transmitting, lead and cadmium bismuthate glasses. The resulting glasses contain, in cation percent, 8 to 80% Bi2O3, 0-57% PbO, 0-32% CdO, at least 5% Pbo + CdO, 5-32.5% Fe2O3, and 0-15% miscellaneous other oxides.
Inventors
- 👤 A Berleue
- 👤 W Dumbaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:27
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/122; C03C4/00; C03C4/10; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
26 words
An infrared transmitting glass in accordance with claim 1 and consisting essentially of 30 to 80% Bi2O3, 7 to 50% PbO and 10 to 25% Fe2O3.
Claim 2
Dependent Claim
26 words
An infrared transmitting glass in accordance with claim 1 and consisting essentially of 45 to 75% Bi2O3, 5 to 32% CdO and 12 to 30% Fe2O3.
Claim 3
Dependent Claim
26 words
An infrared transmitting glass in accordance with claim 1 in which the composition additionally contains up to 15% of at least one other compatible glassmaking constituent.
Claim 4
Dependent Claim
24 words
An infrared transmitting glass in accordance with claim 4 wherein an additional constituent is ZnO and/or BaO in a total amount not exceeding 7.5%.
Claim 5
Dependent Claim
24 words
An infrared transmitting glass in accordance with Claim 4 wherein an additional constituent is up to 5% of at least one transition metal oxide.
Claim 6
Dependent Claim
23 words
An infrared transmitting glass in accordance with claim 4 wherein the total content of SiO2 and B2O3, if any, does not exceed 2%.
Claim 7
Independent Claim
38 words
A method of stabilizing a lead or cadmium bismuthate glass by including in the batch from which the glass is melted a compound of iron in an amount providing 5 to 32.5 cation percent Fe2O3 in the melt.
References Cited (Backward Citations)
US3723141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |