US2999546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Side port valve assembly well tools
Assignee: Otis Engineering Corp
•
Filing: 1957-01-30
•
Granted: 1961-09-12
•
Expires: 1977-01-30
Abstract
No abstract record available.
Inventors
- 👤 George G Grimmer
- 👤 Harry B Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:29
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934; Y10T137/8593; Y10T137/877; Y10T137/87708
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US288446A
Cited
US2371220A
Cited
US2368406A
Cited
US2377981A
Cited
US2655216A
Cited
US2804830A
Cited
US2790501A
Cited
US2904058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |