Patent US3421778A successfully refreshed from Google Patents.
US3421778A
Expired / Lapsed
US
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Dual purpose dolly for semitrailers
Assignee: Utility Trailer Manufacturing Co
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Filing: 1966-11-18
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Granted: 1969-01-14
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Expires: 1986-11-18
Abstract
No abstract record available.
Inventors
- 👤 Stephen Barker
- 👤 Ray D Fleck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:51
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/04; B62D53/08; B62D53/0857; B62D53/0864
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2330897A
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US2391372A
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US2727755A
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US2809851A
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US2847230A
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US2978259A
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US3203711A
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US3246912A
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US3312479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |