US3481629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System of operating close coupled trailer units
Assignee: Primrose Third Axle Co Ltd
•
Filing: 1967-05-16
•
Granted: 1969-12-02
•
Expires: 1987-05-16
Abstract
No abstract record available.
Inventors
- 👤 George Whitwell Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:01
CPC Classifications
B; B62; B62D; B62D13/00; B60; B60D; B60D1/00; B60P; B60P1/00; B60P1/64; B60P1/6418; B60P1/6481
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2333853A
Cited
FR1078037A
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US2919928A
Cited
US2976051A
Cited
US2998261A
Cited
US3102738A
Cited
US3162320A
Cited
US3317219A
Cited
US3381974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |