US2601611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crown block
Assignee: Emsco Derrick and Equipment Co
•
Filing: 1947-04-19
•
Granted: 1952-06-24
•
Expires: 1967-04-19
Abstract
No abstract record available.
Inventors
- 👤 Howard D Hilborn
- 👤 William D Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:39
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/04; B66D3/06; B66D3/08; B66D2700/00; B66D2700/02; B66D2700/026; B66D2700/028
Claims Analysis
Total Claims: 0
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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) | 1955-06-24 | 1955-12-24 | 1956-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-24 | 1959-12-24 | 1960-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-24 | 1963-12-24 | 1964-06-24 | $7700.00 | Window Closed / Lapsed |