US2875775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas lift valve
Assignee: Otis Engineering Corp
•
Filing: 1953-05-25
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Granted: 1959-03-03
•
Expires: 1973-05-25
Abstract
No abstract record available.
Inventors
- 👤 Leslie L Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:54
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US932934A
Cited
US1739041A
Cited
US2118428A
Cited
US2622620A
Cited
US2706612A
Cited
US2766765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |