Patent US3373823A successfully refreshed from Google Patents.
US3373823A
Expired / Lapsed
US
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Well drilling control system
Assignee: Individual
•
Filing: 1965-09-20
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Granted: 1968-03-19
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Expires: 1985-09-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Hal B Fullerton
- 👤 Richard C Webb
- 👤 Jon E Benner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:58
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084; E21B44/00; G; G05; G05D; G05D17/00; G05D17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1913752A
Cited
US2005889A
Cited
US2032155A
Cited
US2298222A
Cited
US2651198A
Cited
US2609181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |