Patent US3582271A successfully refreshed from Google Patents.
US3582271A
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US
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Method for manufacturing alumina whiskers
Assignee: Hitachi Ltd
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Filing: 1968-07-11
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Granted: 1971-06-01
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Expires: 1988-07-11
Abstract
Abstract ALUMINA WHISKERS HAVING A HIGH STRENGTH ARE MANUFACTURED IN A HIGH YIELD BY PASSING A HYDROGEN GAS CONTAINING WATER VAPOR HAVING A PARTIAL PRESSURE OF NOT MORE THAN 5X10**4 ATM. AND ALUMINUM CHLORIDE HAVING A PARTIAL PRESSURE OF 6X10**6 TO 2X10**3 ATM. OVER ALUMINUM OR ITS ALLOYS HEATED TO 1400 TO 1600* C. AND CONDUCTING REACTION OF ALUMINUM VAPOR WITH WATER VAPOR IN THE PRESENCE OF ALUMINUM CHLORIDE VAPOR. ALUMINA WHISKERS ARE USEFUL AS A REINFORCING MATERIAL FOR SYNTHETIC RESIN OR METALLIC MATERIAL.
Inventors
- 👤 Shigekazu Minagawa
- 👤 Tadashi Saito
- 👤 Tetuo Gejo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:31
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/42; C01F7/422; C30; C30B; C30B25/00; C30B25/005; C30B29/00; C30B29/10; C30B29/16; C30B29/20; C01P; C01P2004/00; C01P2004/10
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |