US2912495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for viewing oil well bore hole
Assignee: Individual
•
Filing: 1956-02-03
•
Granted: 1959-11-10
•
Expires: 1976-02-03
Abstract
No abstract record available.
Inventors
- 👤 Moon James
- 👤 Robert C Crooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1331627A
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US1790678A
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US2176554A
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US2334475A
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US2638675A
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US2632801A
Cited
US2671323A
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US2737864A
Cited
US2677996A
Cited
US2812697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-09 | 1963-05-11 | 1963-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-09 | 1967-05-11 | 1967-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-09 | 1971-05-11 | 1971-11-10 | $7700.00 | Window Closed / Lapsed |