US2846247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling head
Assignee: Guiberson Corp
•
Filing: 1953-11-23
•
Granted: 1958-08-05
•
Expires: 1973-11-23
Abstract
No abstract record available.
Inventors
- 👤 Earl W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:57
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; E21B33/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2126007A
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US2692152A
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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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |