Patent US3041087A successfully refreshed from Google Patents.
US2997315A
Expired / Lapsed
US
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Pivotal trailer unit
Assignee: Unit Rig and Equipment Co
•
Filing: 1960-05-09
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Granted: 1961-08-22
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Expires: 1980-05-09
Abstract
No abstract record available.
Inventors
- 👤 Richard L Sittel
- 👤 Truett M Cone
- 👤 Ambrose S Ringwald
- 👤 Solon D Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:47
CPC Classifications
B; B62; B62D; B62D53/00; B62D53/04; B62D53/06; B60; B60P; B60P1/00; B60P1/04; B60P3/00; B62D53/061; B62D53/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2415706A
Cited
US2579003A
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US2709087A
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US2759737A
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US2878033A
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US2894764A
Cited
US2904340A
Cited
US2960123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |