US2853265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic valve apparatus for testing well bore tubing
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1955-08-12
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Granted: 1958-09-23
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Expires: 1975-08-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Earnest H Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:49
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/12; E21B47/00; E21B47/10; E21B47/117; F; F16; F16K; F16K3/00; F16K3/22; F16K3/24; F16K3/26; E21B2200/00; E21B2200/05; Y; Y10; Y10S; Y10S285/00; Y10S285/922; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE361913C
Cited
US2101160A
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US1698490A
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US2053602A
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US2178540A
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US2543509A
Cited
GB665797A
Cited
US2585706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |