Patent US4550439A successfully refreshed from Google Patents.
Patent US3518948A successfully refreshed from Google Patents.
US3518948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway trucks with elastomeric biased side bearings
Assignee: British Railways Board
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Filing: 1967-04-20
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Granted: 1970-07-07
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Expires: 1987-04-20
Abstract
No abstract record available.
Inventors
- 👤 Brian Leonard King
- 👤 Ronald Arthur Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:21
CPC Classifications
B; B61; B61F; B61F5/00; B61F5/02; B61F5/22; B61F5/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US450157A
Cited
US637498A
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US2058623A
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US2259049A
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US2740360A
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US2788250A
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US2917007A
Cited
US3045998A
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US3401991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |