US2772491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ditch digger
Assignee: LAFAYETTE M PURVIS
•
Filing: 1952-09-18
•
Granted: 1956-12-04
•
Expires: 1972-09-18
Abstract
No abstract record available.
Inventors
- 👤 William M Stansbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:40
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/08; E02F3/10; E02F3/086; E02F3/12; E02F3/14; E02F3/142
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1375060A
Cited
US1630231A
Cited
US2231983A
Cited
US2591643A
Cited
US2488990A
Cited
US2684542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |