US3100688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed silicon carbide
Assignee: Union Carbide Corp
•
Filing: 1961-10-04
•
Granted: 1963-08-13
•
Expires: 1981-10-04
Abstract
No abstract record available.
Inventors
- 👤 Howard M Dess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:50
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/0022; C04B38/0025; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/984
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS FOR THE PRODUCTION OF FOAMED SILICON CARBIDE WHICH COMPRISES PROVIDING A FINELY DIVIDED MIXTURE OF CARBON AND ELEMENTAL SILICON POWDER; INTIMATELY CONTACTING SAID MIXTURE WITH AQUEOUS HYDROFLUORIC ACID TO FORM A STABLE FOAM SAID HYDROFLUORIC ACID BEING IN AN AMOUNT SUBSTANTIALLY LESS THAN STOICHIOMETRIC FOR REACTION WITH THE SILICON IN THE MIXTURE DRYING SAID FOAM; HEATING SAID FOAM IN A NON-OXIDIZING ATMOSPHERE TO INTIATE THE SILICON CARBIDE FORMING REACTION WITHOUT SUBSTANTIAL MELTING OF UNREACTED SILICON AND CONTINUING HEATING SAID FOAM UNTIL SUBSTANTIAL COMPLETION OF THE CARBIDING REACTION.
Claim 2
Dependent Claim
89 words
A PROCESS FOR THE PRODUCTION OF FOAMED SILICON CARBIDE WHICH COMPRISES PROVIDING A FINELY DIVIDED MIXTURE OF CARBON AND ELEMENTAL SILICON POWDER; INTIMATELY CONTACTING SAID MIXTURE WITH AQUEOUS HYDROFLUORIC ACID TO FORM A STABLE FOAM SAID HYDROFLUORIC ACID BEING IN AN AMOUNT SUBSTANTIALLY LESS THAN STOICHIOMETRIC FOR REACTION WITH THE SILICON IN THE MIXTURE DRYING SAID FOAM; HEATING SAID FOAM IN A NON-OXIDIZING ATMOSPHERE TO INTIATE THE SILICON CARBIDE FORMING REACTION WITHOUT SUBSTANTIAL MELTING OF UNREACTED SILICON AND CONTINUING HEATING SAID FOAM UNTIL SUBSTANTIAL COMPLETION OF THE CARBIDING REACTION.
References Cited (Backward Citations)
US2431326A
Cited
US2942951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |