US2873765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thread protectors for well sucker-rods
Assignee: E A POLUMBUS JR
•
Filing: 1957-02-27
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Granted: 1959-02-17
•
Expires: 1977-02-27
Abstract
No abstract record available.
Inventors
- 👤 Elmer O Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:56
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/006; B; B65; B65D; B65D59/00; B65D59/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |