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Patent US2941405A successfully refreshed from Google Patents.
US2941405A
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US
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Mud sampler and pressure indicator
Assignee: Gulf Research and Development Co
•
Filing: 1956-04-10
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Granted: 1960-06-21
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Expires: 1976-04-10
Abstract
No abstract record available.
Inventors
- 👤 Peter F Southwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:28
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1981817A
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US2249815A
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US2187947A
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US2378135A
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US2464456A
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US2615080A
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US2751456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |