Patent US2703697A successfully refreshed from Google Patents.
US2703697A
Expired / Lapsed
US
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Process and apparatus for well coring
Assignee: Individual
•
Filing: 1950-12-15
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Granted: 1955-03-08
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Expires: 1970-12-15
Abstract
No abstract record available.
Inventors
- 👤 Robert D Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:41
CPC Classifications
E; E21; E21B; E21B25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1784886A
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US1883321A
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US1803731A
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US1828775A
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US1853581A
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US2264449A
Cited
US2347726A
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US2287909A
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US2461164A
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US2551995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-07 | 1958-09-06 | 1959-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-07 | 1962-09-06 | 1963-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-07 | 1966-09-06 | 1967-03-08 | $7700.00 | Window Closed / Lapsed |