Patent US1869648A successfully refreshed from Google Patents.
US1869648A
Expired / Lapsed
US
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Contact spring supporting and adjusting structure
Assignee: Hitachi Rail STS USA Inc
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Filing: 1931-12-26
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Granted: 1932-08-02
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Expires: 1951-12-26
Abstract
No abstract record available.
Inventors
- 👤 Harry E Ashworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:39
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/54; H01H1/00; H01H1/12; H01H1/14; H01H1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-08-02 | 1936-02-01 | 1936-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-02 | 1940-02-01 | 1940-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-02 | 1944-02-01 | 1944-08-02 | $7700.00 | Window Closed / Lapsed |