US3137247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operating mechanism for doors on hopper type cars
Assignee: Magor Car Corp
•
Filing: 1961-08-04
•
Granted: 1964-06-16
•
Expires: 1981-08-04
Abstract
No abstract record available.
Inventors
- 👤 Samuel C Hamilton
- 👤 Lagerveld Sebastian Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:04
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/14; B61D7/16; B61D7/24; B61D7/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1295246A
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US1297356A
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US1368372A
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US1482559A
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US1515834A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |