Patent US3476525A successfully refreshed from Google Patents.
US3476525A
Expired / Lapsed
US
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Production of boron carbide flakes
Assignee: National Research Corp
•
Filing: 1966-09-26
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Granted: 1969-11-04
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Expires: 1986-09-26
Abstract
No abstract record available.
Inventors
- 👤 Lloyd R Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:04
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/0005; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/991; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1987576A
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US1897214A
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US2996783A
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US3094395A
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US3111461A
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US3183563A
Cited
US3398013A
Cited
US3334967A
Cited
US3389022A
Cited
FR2328776A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |