Patent US2275974A successfully refreshed from Google Patents.
US3054221A
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Opal, 96% silica glass and method of production
Assignee: Corning Glass Works
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Filing: 1958-09-04
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Granted: 1962-09-18
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Expires: 1978-09-04
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Elmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:57
CPC Classifications
C; C03; C03C; C03C23/00; C03C23/0095; C03C3/00; C03C3/04; C03C3/06; C03C2201/00; C03C2201/06; C03C2201/08; C03C2201/10; C03C2201/30; C03C2201/32; C03C2201/34; C03C2201/3423; C03C2201/50; C03C2203/00; C03C2203/50
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
A METHOD OF MAKING AN OPAL, 96% SILICA GLASS WHICH COMPRISES IMPREGNATING A LEACHED, POROUS, 96% SILICA GLASS WITH A CERIUM COMPOUND THAT IS THERMALLY DECOMPOSABLE TO CERIUM OXIDE, HEATING THE IMPREGNATED GLASS IN A REDUCING ATMOSPHERE AT A TEMPERATURE BELOW THE POROUS GLASS CONSOLIDATION TEMPERATURE TO FORM A REDUCED OXIDE OF CERIUM WITHIN THE GLASS AND THEREAFTER HEATING THE GLASS AT A HIGHER TEMPERATURE TO EFFECT CONSOLIDATION OF THE POROUS GLASS INTO A NON-POROUS GLASS CONSISTING ESSENTIALLY OF THE 96% SILICA GLASS AND THE REDUCED OXIDE OF CERIUM AS THE OPACIFYING AGENT.
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) | 1965-09-17 | 1966-03-19 | 1966-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-17 | 1970-03-19 | 1970-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-17 | 1974-03-19 | 1974-09-18 | $7700.00 | Window Closed / Lapsed |