Patent US2958604A successfully refreshed from Google Patents.
US2958604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica glass
Assignee: Saint Gobain Quartz SAS
•
Filing: 1957-07-10
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Granted: 1960-11-01
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Expires: 1977-07-10
Abstract
No abstract record available.
Inventors
- 👤 Henri J C George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:03
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/06; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A TRANSPARENT SILICA GLASS CONSISTING OF SUBSTANTIALLY PURE SILICON DIOXIDE CONTAINING CERIUM OXIDE IN AN AMOUNT OF BETWEEN ABOUT 0.5X10**-4 AND 10**-3 PARTS OF CERIUM OXIDE EXPRESSED AS CEO2 PER PART OF SILICON DIOXIDE.
Claim 2
Dependent Claim
34 words
A TRANSPARENT SILICA GLASS CONSISTING OF SUBSTANTIALLY PURE SILICON DIOXIDE CONTAINING CERIUM OXIDE IN AN AMOUNT OF BETWEEN ABOUT 0.5X10**-4 AND 10**-3 PARTS OF CERIUM OXIDE EXPRESSED AS CEO2 PER PART OF SILICON DIOXIDE.
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) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |