Patent US3479724A successfully refreshed from Google Patents.
US3479724A
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US
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Method of expanding a railway tank car by lengthening same
Assignee: Union Tank Car Co
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Filing: 1967-08-01
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Granted: 1969-11-25
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Expires: 1987-08-01
Abstract
No abstract record available.
Inventors
- 👤 Jack R Kruizenga
- 👤 Donald C Graves
- 👤 Harry Role
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:54
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/74; B65D88/744; B61; B61D; B61D17/00; B61D17/04; B61D17/043; B61D17/045; B61D5/00; B61D5/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49826; Y10T29/49904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1350830A
Cited
US2304354A
Cited
US2907284A
Cited
FR1221689A
Cited
US3277842A
Cited
US3389670A
Cited
US3309759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |