US3733394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making chaoite
Assignee: Aerospace Corp
•
Filing: 1970-08-03
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Granted: 1973-05-15
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Expires: 1990-08-03
Abstract
Abstract AN ALLOTROPIC FORM OF CARBON, "CHAOITE," HAVING A WHITE APPEARANCE, A HARDNESS GREATER THAN 9 ON THE MOH SCALE, A DENSITY IN EXCESS OF 3.33 G./C C., IS PRODUCED ON THE SURFACE OF GRAPHITE HEATED TO ABOVE 2550* K. IN AN INERT ATMOSPHERE.
Inventors
- 👤 A Whittaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:19
CPC Classifications
C; C01; C01B; C01B32/00
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |