US2578959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic system for drilling rigs
Assignee: GEORGE E FAILING SUPPLY Co
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Filing: 1948-10-30
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Granted: 1951-12-18
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Expires: 1968-10-30
Abstract
No abstract record available.
Inventors
- 👤 Joel E Yarborough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:09
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/21; F15B2211/212; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/40; F15B2211/405; F15B2211/40507; F15B2211/40515; F15B2211/415; F15B2211/41563; F15B2211/41572; F15B2211/41581; F15B2211/455; F15B2211/46; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/515; F15B2211/5151; F15B2211/55; F15B2211/60; F15B2211/625; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053
Claims Analysis
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References Cited (Backward Citations)
US2005731A
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US2147536A
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US2239566A
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US2239481A
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US2309999A
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US2265987A
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US2392471A
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US2437520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |