Patent US3175884A successfully refreshed from Google Patents.
US3175884A
Expired / Lapsed
US
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Submicron silicon carbide
Assignee: Unifrax I LLC
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Filing: 1961-05-01
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Granted: 1965-03-30
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Expires: 1981-05-01
Abstract
No abstract record available.
Inventors
- 👤 William E Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:05
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/97; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10S277/00; Y10S277/935
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
40 words
AS A NEW ARTICLE OF MANUFACTURE A MASS OF SILICON CARBIDE IN POWDER FROM CHARACTERIZED BY CRYSTALS SUBSTANTIALLY FREE OF RUPTURED SURFACES AND PREDOMINANTLY SUBMICRON IN SIZE, SAID CRYSTALS HAVING A PLURALITY OF CONFIGURATIONS INCLUDING PLATELETS, RIBBON-LIKE FORMS, AND WHISKERS.
References Cited (Backward Citations)
CA592456A
Cited
US2364108A
Cited
US2894929A
Cited
DE1047180B
Cited
US2979449A
Cited
US3014872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |