Patent US2420533A successfully refreshed from Google Patents.
US2420533A
Expired / Lapsed
US
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Walk for railway house cars
Assignee: Standard Railway Equipment Manufacturing Co
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Filing: 1944-01-10
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Granted: 1947-05-13
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Expires: 1964-01-10
Abstract
No abstract record available.
Inventors
- 👤 Garth G Gilpin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:41
CPC Classifications
B; B61; B61D; B61D17/00; B61D17/04; B61D17/12; B61D17/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1611555A
Cited
US1842479A
Cited
US2179634A
Cited
US2198430A
Cited
US2208020A
Cited
US2240217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |