US2943682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wireline control head
Assignee: Dresser Industries Inc
•
Filing: 1956-01-31
•
Granted: 1960-07-05
•
Expires: 1976-01-31
Abstract
No abstract record available.
Inventors
- 👤 Jr William H Ingram
- 👤 Cecil B Greer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:24
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/068; E21B33/072
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1390793A
Cited
US1709949A
Cited
US2176323A
Cited
US2555145A
Cited
US2670225A
Cited
US2748870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |