US2680913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Caliper for determining the shape and diameter of well bores
Assignee: Johnston Testers Inc
•
Filing: 1951-08-10
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Granted: 1954-06-15
•
Expires: 1971-08-10
Abstract
No abstract record available.
Inventors
- 👤 Mordica O Johnston
- 👤 Jack A Moosman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:11
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US713784A
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US2102080A
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US2267110A
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US2340987A
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US2415636A
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US2392357A
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US2518663A
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US2497990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |