Patent US3028820A successfully refreshed from Google Patents.
US3028820A
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US
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Railroad car truck
Assignee: United States Steel Corp
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Filing: 1960-11-16
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Granted: 1962-04-10
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Expires: 1980-11-16
Abstract
No abstract record available.
Inventors
- 👤 John H Fannce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:53
CPC Classifications
B; B61; B61F; B61F5/00; B61F5/38; B60; B60B; B60B37/00; B60B37/10; B61F3/00; B61F3/16; B61F5/02; B61F5/04; B61F5/06; B61F5/26; B61F5/28; B61F5/30; B61F5/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |