Patent US3481281A successfully refreshed from Google Patents.
US3481281A
Expired / Lapsed
US
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Tow truck switch system
Assignee: SI Handling Systems Inc
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Filing: 1967-04-17
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Granted: 1969-12-02
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Expires: 1987-04-17
Abstract
No abstract record available.
Inventors
- 👤 Graham K Johnson
- 👤 Paul R Hefler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:51
CPC Classifications
B; B62; B62D; B62D1/00; B62D1/24; B61; B61B; B61B10/00; B61B10/04; E; E01; E01B; E01B25/00; E01B25/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3406638A
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 |