Patent US3291074A successfully refreshed from Google Patents.
US3291074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer hitch for flat cars
Assignee: Bethlehem Steel Corp
•
Filing: 1964-12-14
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Granted: 1966-12-13
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Expires: 1984-12-14
Abstract
No abstract record available.
Inventors
- 👤 Nicholas D Remy
- 👤 George J Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:40
CPC Classifications
B; B61; B61D; B61D45/00; B61D45/001; B61D45/004; B61D45/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3145006A
Cited
US3087748A
Cited
US3143083A
Cited
US3189306A
Cited
US3142466A
Cited
US3168878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |