US2633645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well surveying instrument
Assignee: Sperry Sun Well Surveying Co
•
Filing: 1949-07-01
•
Granted: 1953-04-07
•
Expires: 1969-07-01
Abstract
No abstract record available.
Inventors
- 👤 Einar T Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:51
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1424804A
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GB117161A
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US1376727A
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US1679764A
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US2041072A
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US2056715A
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US2008481A
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US2124892A
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US2215622A
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US2364908A
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US2313168A
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US2428346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |