US2812191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four wheel steering for mine tractors
Assignee: Individual
•
Filing: 1952-11-25
•
Granted: 1957-11-05
•
Expires: 1972-11-25
Abstract
No abstract record available.
Inventors
- 👤 Jr John L Kersey
- 👤 Frank N Kersey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:18
CPC Classifications
B; B60; B60K; B60K1/00; B60K17/00; B60K17/34; B60K17/356; B60K17/358; B62; B62D; B62D7/00; B62D7/06; B62D7/14; B62D7/142; B60K2001/001; B60Y; B60Y2200/00; B60Y2200/40; B60Y2200/41
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |