Reinforced carbon and graphite articles
Abstract
Abstract A REINFORCED CARBON ARTICLE WHICH COMPRISES A CARBON FIBER SHAPE BONDED BY A CARBON BINDER AND HAVING INCORPORATED WITHIN SAID ARTICLE THE IN SITU REACTION PRODUCT OF CARBON AND A BORON CONTAINING ADDITIVE WHICH COMPRISES A MATERIAL SELECTED FROM THE GROUP CONSISTING OF BORON, BORON NITRIDE, BORON SILICIDE AND REFRACTORY METAL BORIDES; AND THE PROCESS OF MAKING SAID ARTICLE WHICH COMPRISES FORMING A CARBON FIBER SHAPE, DISPERSING THE BORON CONTAINING ADDITIVE WITHIN AT LEAST A PORTION OF SAID CARBON FIBER SHAPE, IMPREGNATING SAID CARBON FIBER SHAPE WITH A CARBONIZABLE BINDER, AND HEATING SAID SHAPE TO CARBONIZE THE BINDER AND TO FORM IN SITU THE REACTION PRODUCT OF CARBON AND SAID BORON CONTAINING ADDITIVE.
Inventors
- 👤 Leo C Ehrenreich
Bibliographic Details
Claims Analysis
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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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |