US2624548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excavator having means for forming polygonal holes
Assignee: Individual
•
Filing: 1950-09-05
•
Granted: 1953-01-06
•
Expires: 1970-09-05
Abstract
No abstract record available.
Inventors
- 👤 Harry G Cochrane
- 👤 Sam W Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:41
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/001; Y; Y10; Y10T; Y10T408/00; Y10T408/34; Y10T408/356; Y10T408/50; Y10T408/60
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-06 | 1956-07-07 | 1957-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-06 | 1960-07-07 | 1961-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-06 | 1964-07-07 | 1965-01-06 | $7700.00 | Window Closed / Lapsed |