US2609939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lowerable a-frame
Assignee: Caterpillar Global Mining LLC
•
Filing: 1948-01-10
•
Granted: 1952-09-09
•
Expires: 1968-01-10
Abstract
No abstract record available.
Inventors
- 👤 Trevor O Davidson
- 👤 Bruno L Lonngren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:47
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE339191C
Cited
US1725952A
Cited
US1943196A
Cited
US2348285A
Cited
US2335858A
Cited
US2374074A
Cited
US2411305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |