Patent US3671306A successfully refreshed from Google Patents.
US3671306A
Expired / Lapsed
US
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Boron carbide film product
Assignee: National Research Corp
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Filing: 1969-11-28
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Granted: 1972-06-20
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Expires: 1989-11-28
Abstract
Abstract BORON CARBIDE FILMS PRODUCED BY VACUUM DEPOSITION. THE FILMS ARE BLACK AND SHINY, AMORPHOUS AND HAVE BEND TENSILE STRENGTH ON THE ORDER OF 300,000 P.S.I. AND ELASTIC MODULUS OF 40 MILLION P.S.I.
Inventors
- 👤 Lloyd R Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:55
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/0635; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678; Y10T428/31721
Claims Analysis
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |