US3698891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of alumina silver composites
Assignee: WR Grace and Co
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Filing: 1969-09-05
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Granted: 1972-10-17
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Expires: 1989-09-05
Abstract
Abstract ALUMINA CERAMICS CONTAINING MORE THAN ONE PERCENT SILVER ARE PREPARED BY SEQUENTIALLY TREATING AND ALUMINA HYDROSOL WITH A REDUCING AGENT AND A SILVER SALT, OR VICE VERSA. THE MATERIAL IS TREATED IN A FLUID ENERGY MILL WHICH IS OPERATED AT A HIGH TEMPERATURE. THE MATERIAL IS THEN CALCINED AND SINTERED. THE SILVER CONTAINING ALUMINA OF THIS INVENTION ARE USEFUL AS ABLATIVE COMPOSITIONS.
Inventors
- 👤 Arvind S Patil
- 👤 George E Ashby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:08
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |