Patent CA1167727A successfully refreshed from Google Patents.
US2581510A
Expired / Lapsed
US
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Electric relays
Assignee: Westinghouse Air Brake Co
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Filing: 1949-01-08
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Granted: 1952-01-08
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Expires: 1969-01-08
Abstract
No abstract record available.
Inventors
- 👤 Harry E Ashworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:08
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/86; H01H50/88
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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |