US2598520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borehole temperature recorder
Assignee: Eastman Oil Well Survey Co
•
Filing: 1946-04-19
•
Granted: 1952-05-27
•
Expires: 1966-04-19
Abstract
No abstract record available.
Inventors
- 👤 Harlan J Eastman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:21
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; E21B47/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1901431A
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GB344851A
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US1898473A
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US2223913A
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US2144762A
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US2265098A
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US2382609A
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US2365487A
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US2343372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |