Patent US2979142A successfully refreshed from Google Patents.
US2979142A
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US
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Apparatus for drilling wells
Assignee: Phillips Petroleum Co
•
Filing: 1957-07-03
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Granted: 1961-04-11
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Expires: 1977-07-03
Abstract
No abstract record available.
Inventors
- 👤 James A Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:00
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/12; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1527
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1899438A
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US2712434A
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US2728556A
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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) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |