US2880964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well digging machine
Assignee: Individual
•
Filing: 1953-08-17
•
Granted: 1959-04-07
•
Expires: 1973-08-17
Abstract
No abstract record available.
Inventors
- 👤 Dorsey E Straitiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:42
CPC Classifications
E; E21; E21B; E21B11/00; E21B11/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1514158A
Cited
US1396625A
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US1476726A
Cited
US1913403A
Cited
US2283212A
Cited
US2119661A
Cited
US2134164A
Cited
US2216177A
Cited
US2551510A
Cited
US2653794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |