Patent CA438134A successfully refreshed from Google Patents.
Patent US3403638A successfully refreshed from Google Patents.
US3403638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway vehicle suspension
Assignee: Metalastik Ltd
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Filing: 1964-12-31
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Granted: 1968-10-01
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Expires: 1984-12-31
Abstract
No abstract record available.
Inventors
- 👤 Hirst Archie John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:38
CPC Classifications
B; B61; B61F; B61F5/00; B61F5/02; B61F5/16; B61F5/14; B61F5/148; B61F5/22; B61F5/24
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) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |