US2639931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling for earth boring units
Assignee: Individual
•
Filing: 1949-01-06
•
Granted: 1953-05-26
•
Expires: 1969-01-06
Abstract
No abstract record available.
Inventors
- 👤 Charles W Kandle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:23
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/046; E21B7/00; E21B7/26; F; F16; F16B; F16B7/00; F16B7/04; F16B7/0406; F16B7/0413; F16D; F16D1/00; F16D1/02; Y; Y10; Y10T; Y10T403/00; Y10T403/55; Y10T403/60; Y10T403/602; Y10T403/604
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US256728A
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US2260811A
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US2588901A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |