US2561343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grave digger
Assignee: Individual
•
Filing: 1948-08-05
•
Granted: 1951-07-24
•
Expires: 1968-08-05
Abstract
No abstract record available.
Inventors
- 👤 Muryl G Crossley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:35
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/003; E21B7/005; E02; E02F; E02F3/00; E02F3/04; E02F3/18; E21B7/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US969897A
Cited
US1113277A
Cited
US1290550A
Cited
US1288685A
Cited
US1499561A
Cited
US1866037A
Cited
US2197989A
Cited
US2334830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |