US2690630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Producing asteriated corundum crystals
Assignee: Union Carbide Corp
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Filing: 1951-12-28
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Granted: 1954-10-05
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Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 William G Eversole
- 👤 John N Burdick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:14
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD OF ASTERIATING A SINGLE CRYSTAL OF CORUNDUM WHICH COMPRISES HOLDING SUCH A CRYSTAL AT A TEMPERATURE BETWEEN 1700* AND 1950* C. WHILE MAINTAINING TITANIUM OXIDE IN CONTACT WITH THE SURFACE THEREOF, TO INTRODUCE SOME OF SAID TITANIUM OXIDE INTO SAID CRYSTAL; AND THEN HOLDING SAID CRYSTAL AT A TEMPERATURE BETWEEN 1100* AND 1500* TO DEVELOP ASTERISM THEREIN.
Claim 2
Independent Claim
59 words
A METHOD OF ASTERIATING A SINGLE CRYSTAL OF CORUNDUM WHICH COMPRISES HOLDING SUCH A CRYSTAL AT A TEMPERATURE BETWEEN 1700* AND 1950* C. WHILE MAINTAINING TITANIUM OXIDE IN CONTACT WITH THE SURFACE THEREOF, TO INTRODUCE SOME OF SAID TITANIUM OXIDE INTO SAID CRYSTAL; AND THEN HOLDING SAID CRYSTAL AT A TEMPERATURE BETWEEN 1100* AND 1500* TO DEVELOP ASTERISM THEREIN.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |