Patent US3702881A successfully refreshed from Google Patents.
US3702881A
Expired / Lapsed
US
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Reactive hot pressing an oxide through its polymorphic phase change
Assignee: Canadian Patents and Development Ltd
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Filing: 1970-06-08
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Granted: 1972-11-14
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Expires: 1990-06-08
Abstract
Abstract A PROCESS FOR PRODUCING DENSE HARD OXIDE, AND OXIDECONTAINING PRODUCTS FROM MATERIALS CONSISTING OF OR CONTAINING AN OXIDE CAPABLE OF UNDERGOING A POLYMORPHIC PHASE TRANSFORMATION WHEN HEATED TO A TEMPERATURE OF GENERALLY BETWEEN 200*C.AND 1200*C., WHICH PROCESS INCLUDES HEATING THE MATERIAL TO SAID TRANSFORMATION TEMPERATURE AND AT LEAST WHILE THE TRANSFORMATION IS OCCURRING, APPLYING PRESSURE TO THE MATERIAL. D R A W I N G
Inventors
- 👤 Asoke Chandra Das Chaklader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:08
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/32
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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |