Patent US2407877A successfully refreshed from Google Patents.
US2407877A
Expired / Lapsed
US
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Interlock apparatus
Assignee: Westinghouse Air Brake Co
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Filing: 1942-07-30
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Granted: 1946-09-17
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Expires: 1962-07-30
Abstract
No abstract record available.
Inventors
- 👤 John N Good
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:49
CPC Classifications
F; F02; F02D; F02D25/00; B; B63; B63H; B63H21/00; B63H21/21; B63H21/213; B63H21/22; B63H23/00; B63H23/02; B63H23/10; B63H23/12; B63H23/16; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20207; Y10T74/20238
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) | 1949-09-16 | 1950-03-18 | 1950-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-09-16 | 1954-03-18 | 1954-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-09-16 | 1958-03-18 | 1958-09-17 | $7700.00 | Window Closed / Lapsed |