US2176477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for taking earth cores
Assignee: Individual
•
Filing: 1937-01-11
•
Granted: 1939-10-17
•
Expires: 1957-01-11
Abstract
No abstract record available.
Inventors
- 👤 Frederick M Varney
- 👤 Lowell E Redwine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:03
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-10-16 | 1943-04-17 | 1943-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-16 | 1947-04-17 | 1947-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-16 | 1951-04-17 | 1951-10-17 | $7700.00 | Window Closed / Lapsed |