US2974922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubing control valve apparatus
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1957-09-30
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Granted: 1961-03-14
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Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 Julian D Keithahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:57
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/12; F; F16; F16K; F16K31/00; F16K31/44; F16K31/52; F16K31/524; F16K31/52408; F16K31/52441; E21B2200/00; E21B2200/04
Claims Analysis
Total Claims: 0
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US2070489A
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US2433405A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |