Patent US1840112A successfully refreshed from Google Patents.
Patent US2614946A successfully refreshed from Google Patents.
US2614946A
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Granular silicon carbide and method of making same
Assignee: Unifrax I LLC
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Filing: 1950-03-17
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Granted: 1952-10-21
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Expires: 1970-03-17
Abstract
No abstract record available.
Inventors
- 👤 Charles B Proudfoot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:20
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A METHOD OF MAKING GRANULAR SILICON CARBIDE MATERIAL HAVING IN LOOSE BULK FORM AN ELECTRICAL RESISTANCE COMPARABLE TO GRANULAR CARBON OF SIMILAR SIZE WHICH COMPRISES HEATING GRANULAR SILICON CARBIDE TO A TEMPERATURE AT WHICH IT WILL REACT WITH GASEOUS CHLORINE, PASSING A STREAM OF CHLORINE OVER THE HOT SILICON CARBIDE TO EFFECT REACTION THEREWITH, AND STOPPING THE REACTION AFTER IT HAS PROGRESSED ONLY A SLIGHT DISTANCE INWARDLY OF THE GRANULES OF SILICON CARBIDE.
Claim 2
Independent Claim
73 words
A METHOD OF MAKING GRANULAR SILICON CARBIDE MATERIAL HAVING IN LOOSE BULK FORM AN ELECTRICAL RESISTANCE COMPARABLE TO GRANULAR CARBON OF SIMILAR SIZE WHICH COMPRISES HEATING GRANULAR SILICON CARBIDE TO A TEMPERATURE AT WHICH IT WILL REACT WITH GASEOUS CHLORINE, PASSING A STREAM OF CHLORINE OVER THE HOT SILICON CARBIDE TO EFFECT REACTION THEREWITH, AND STOPPING THE REACTION AFTER IT HAS PROGRESSED ONLY A SLIGHT DISTANCE INWARDLY OF THE GRANULES OF SILICON CARBIDE.
References Cited (Backward Citations)
US1973703A
Cited
US2149671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |