Patent US3680688A successfully refreshed from Google Patents.
Patent US2401576A successfully refreshed from Google Patents.
US2401576A
Expired / Lapsed
US
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Device for measuring length of a line run into or removed from a bore hole
Assignee: Individual
•
Filing: 1943-09-22
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Granted: 1946-06-04
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Expires: 1963-09-22
Abstract
No abstract record available.
Inventors
- 👤 Richard C Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:37
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/04
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) | 1949-06-03 | 1949-12-03 | 1950-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-06-03 | 1953-12-03 | 1954-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-06-03 | 1957-12-03 | 1958-06-04 | $7700.00 | Window Closed / Lapsed |