US3450220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic drawbar hitch
Assignee: JACK W FRANDSEN
•
Filing: 1967-04-04
•
Granted: 1969-06-17
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Expires: 1987-04-04
Abstract
No abstract record available.
Inventors
- 👤 Jack W Frandsen
- 👤 Wallace C Frandsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:45
CPC Classifications
B; B60; B60D; B60D1/00; B60D1/24; B60D1/42; B60D1/46; B60D1/465; A; A01; A01B; A01B59/00; A01B59/04; A01B59/042; A01B59/043; B60D1/36; B62; B62D; B62D53/00; B62D53/04; B62D53/06; B62D53/061; B62D53/062; B62D53/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2321516A
Cited
US2341807A
Cited
US2441285A
Cited
US2579274A
Cited
FR1126326A
Cited
GB807058A
Cited
US3299979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |