Patent US3786124A successfully refreshed from Google Patents.
US3786124A
Expired / Lapsed
US
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Method of sintering fused silica ceramic for strengthening it
Assignee: Ceramic Finishing Co
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Filing: 1971-02-08
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Granted: 1974-01-15
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Expires: 1991-02-08
Abstract
Abstract A METHOD OF SINTERING FUSED SILICA CERAMIC, ESPECIALLY SLIP CAST FUSED SILICA, FOR IMPROVING THE STRENGTH OF THE SINTERED FUSED SILICA CERAMIC. AN UNSINTERED PREFORMED BODY OF FUSED SILICA CERAMIC IS SUBJECTED, DURING SINTERING TO VAPOR FROM A HEAT DECOMPOSABLE FLUORIDE, PREFERABLY ONE TAKEN FROM THE GROUP CONSISTING OF ALUMINUM FLUORIDE, CADMIUM FLUORIDE AND ZINC FLUORIDE, AT A TEMPERATURE OF FROM 600*-900*C. FOR A PERIOD OF TIME SUCH THAT THE PORTION OF THE BODY WHICH IS TO HAVE THE STRENGTH IMPROVED IS KEPT AT THE TREATING TEMPERATURE FOR FROM 1-4 HOURS.
Inventors
- 👤 D Platts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:17
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/01; C04B35/14; C04B35/622; C04B35/64; C04B41/45; C04B41/50; C04B41/5018; C04B41/5019; C04B41/80; C04B41/81; C04B41/85
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |