US2828698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas lift valve assembly
Assignee: Otis Engineering Corp
•
Filing: 1957-04-09
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Granted: 1958-04-01
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Expires: 1977-04-09
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:26
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/03; E21B43/00; E21B43/12; E21B43/121; E21B43/122; E21B43/123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2297044A
Cited
US2230107A
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US2255648A
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US2394977A
Cited
US2606616A
Cited
US2664162A
Cited
US2679903A
Cited
US2679904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |