US1643549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hole-digging mechanism
Assignee: Individual
•
Filing: 1926-01-25
•
Granted: 1927-09-27
•
Expires: 1946-01-25
Abstract
No abstract record available.
Inventors
- 👤 James O Donnelly
- 👤 Francis D Simminger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:05
CPC Classifications
E; E21; E21B; E21B11/00; E21B11/06
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) | 1930-09-26 | 1931-03-28 | 1931-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-09-26 | 1935-03-28 | 1935-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-09-26 | 1939-03-28 | 1939-09-27 | $7700.00 | Window Closed / Lapsed |