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Patent US2693986A successfully refreshed from Google Patents.
US2693986A
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Assignee: CALVIN WHITE H
•
Filing: 1949-01-08
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Granted: 1954-11-09
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Expires: 1969-01-08
Abstract
No abstract record available.
Inventors
- 👤 Ellis H Phreaner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:43
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042; E21B17/1071
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2368415A
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US2468985A
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US2604365A
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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) | 1957-11-08 | 1958-05-10 | 1958-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-08 | 1962-05-10 | 1962-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-08 | 1966-05-10 | 1966-11-09 | $7700.00 | Window Closed / Lapsed |