US3690855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing tio2-sio2 glasses
Assignee: Corning Glass Works
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Filing: 1970-08-19
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Granted: 1972-09-12
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Expires: 1990-08-19
Abstract
Abstract TIO2-SIO2 GLASSES CONTAINING 12-20% BY WEIGHT TIO2 ARE DISCLOSED. THESE GLASSES MAY BE HEAT TREATED TO PROVIDE A CONTROLLED LOW OR ZERO THERMAL COEFFICIENT OF EXPANSION OVER THE RANGE OF -200*C TO +700*C.
Inventors
- 👤 Peter C Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:56
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03B; C03B19/00; C03B19/14; C03B19/1453; C03B32/00; C03B2201/00; C03B2201/06; C03B2201/30; C03B2201/40; C03B2201/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |