US3801688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing high density ceramic products
Assignee: Iowa State University Research Foundation Inc
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Filing: 1971-12-22
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Granted: 1974-04-02
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Expires: 1991-12-22
Abstract
Abstract A PROCESS FOR PRODUCING HIGH DENSITY CERAMIC PRODUCTS BY HOT FORGING OF THE GRANULAR CERAMIC WITH A LIQUID PHASE PRESENT, AND SUBSEQUENTLY HEAT TREATING TO CONVERT THE LIQUID PHASE TO A SOLID PHASE SUFFICIENT TO IMPROVE THE HARDNESS AND STRENGTH AT ELEVATED TEMPERATURES.
Inventors
- 👤 Gee T Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:16
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/54; C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/64; C04B35/645; C04B35/653
Claims Analysis
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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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |