US3031318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low thermal expansion glass
Assignee: International Resistance Co
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Filing: 1960-07-12
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Granted: 1962-04-24
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Expires: 1980-07-12
Abstract
No abstract record available.
Inventors
- 👤 Bhogaraju V Janakirama-Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:16
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/06; C03C2201/00; C03C2201/06; C03C2201/30; C03C2201/40; C03C2203/00; C03C2203/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A GLASS HAVING A THERMAL COEFFICIENT OF LINEAR EXPANSION OF LESS THAN THAT OF FUSED SILICA AND APPROXIMATELY ZERO IN THE RANGE OF 60*C. TO 600*C. CONSISTING ESSENTIALLY OF BY WEIGHT 95% TO 99.9% SILICA, AND 0.1% TO 5% OF AN OXIDE SELECTED FROM THE GROUP CONSISTING OF NIOBIUM OXIDE, TANTALUM OXIDE, AND A MIXTURE OF NIOBIUM OXIDE AND TANTALUM OXIDE.
Claim 2
Dependent Claim
61 words
A GLASS HAVING A THERMAL COEFFICIENT OF LINEAR EXPANSION OF LESS THAN THAT OF FUSED SILICA AND APPROXIMATELY ZERO IN THE RANGE OF 60*C. TO 600*C. CONSISTING ESSENTIALLY OF BY WEIGHT 95% TO 99.9% SILICA, AND 0.1% TO 5% OF AN OXIDE SELECTED FROM THE GROUP CONSISTING OF NIOBIUM OXIDE, TANTALUM OXIDE, AND A MIXTURE OF NIOBIUM OXIDE AND TANTALUM OXIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |