Patent US2645188A successfully refreshed from Google Patents.
US2645188A
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US
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Bolster support means for rail car trucks
Assignee: Doosan Bobcat North America Inc
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Filing: 1950-04-28
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Granted: 1953-07-14
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Expires: 1970-04-28
Abstract
No abstract record available.
Inventors
- 👤 Alfred O Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:35
CPC Classifications
B; B61; B61F; B61F5/00; B61F5/02; B61F5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US114587A
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US373640A
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US450627A
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US2009659A
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GB527468A
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US2319623A
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US2347500A
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US2317308A
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US2538380A
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US2510353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |