Patent US3392681A successfully refreshed from Google Patents.
US3392681A
Expired / Lapsed
US
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Convertible rail-tractor vehicle
Assignee: TRAKWORK EQUIPMENT CO
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Filing: 1964-12-14
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Granted: 1968-07-16
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Expires: 1984-12-14
Abstract
No abstract record available.
Inventors
- 👤 Jr John F Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:57
CPC Classifications
B; B62; B62D; B62D55/00; B62D55/08; B60; B60F; B60F1/00; B60F1/005; B61; B61C; B61C11/00; B61C11/02; B61K; B61K5/00; B61K5/02; B62D55/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US651648A
Cited
US1409378A
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US1448372A
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US1585596A
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US2322919A
Cited
US2344764A
Cited
US2781002A
Cited
US3130686A
Cited
US3182604A
Cited
US3207562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-16 | 1972-01-15 | 1972-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-16 | 1976-01-15 | 1976-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-16 | 1980-01-15 | 1980-07-16 | $7700.00 | Window Closed / Lapsed |