US2725941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Special tool open hole packer
Assignee: Individual
•
Filing: 1953-04-06
•
Granted: 1955-12-06
•
Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Langford W Henshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:57
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/128
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1648377A
Cited
US2093129A
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US2239150A
Cited
US2365639A
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US2663307A
Cited
US2660247A
Cited
US2672934A
Cited
US2657751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |