US2995393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for increasing the coefficient of friction between metal surfaces
Assignee: ChampionX LLC
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Filing: 1957-10-30
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Granted: 1961-08-08
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Expires: 1977-10-30
Abstract
No abstract record available.
Inventors
- 👤 Charp Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
B; B61; B61C; B61C15/00; B61C15/08; B61C15/10; B61C15/102; B05; B05B; B05B5/00; B05B5/025; B05B5/03; B05B5/032
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |