Patent US3567251A successfully refreshed from Google Patents.
US3567251A
Expired / Lapsed
US
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Equalizing trailer hitch
Assignee: Big Boy Products Inc
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Filing: 1969-05-13
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Granted: 1971-03-02
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Expires: 1989-05-13
Abstract
Abstract A TRAILER HITCH COUPLING USABLE WITH EQUALIZING BARS PIVOTALLY MOUNTED THEREIN, THE COUPLING HAVING WEDGE MEANS THEREIN FOR BOTH MAINTAINING THE BARS SECURELY WITHIN THE COUPLING AND FOR ACCOMMODATING DIFFERENT SIZES OF EQUALIZING BARS.
Inventors
- 👤 John Broocks Dalton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:37
CPC Classifications
B; B60; B60D; B60D1/00; B60D1/24; B60D1/30; B60D1/34; B60D1/345
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |