US2594029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reading device for core orienting equipment
Assignee: Eastman Oil Well Survey Co
•
Filing: 1948-07-31
•
Granted: 1952-04-22
•
Expires: 1968-07-31
Abstract
No abstract record available.
Inventors
- 👤 Charles F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:56
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1921508A
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US2190790A
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US2089216A
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US2186677A
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US2149716A
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US2149715A
Cited
US2357617A
Cited
US2489566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |