Patent US2571973A successfully refreshed from Google Patents.
US2571973A
Expired / Lapsed
US
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Annunciator
Assignee: Westinghouse Air Brake Co
•
Filing: 1947-08-13
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Granted: 1951-10-16
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Expires: 1967-08-13
Abstract
No abstract record available.
Inventors
- 👤 Walker Alec Hervey Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:32
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/487; H04M3/4872
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1218324A
Cited
US1227523A
Cited
US1530363A
Cited
US1991727A
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US1926876A
Cited
US2321944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-15 | 1955-04-16 | 1955-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-15 | 1959-04-16 | 1959-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-15 | 1963-04-16 | 1963-10-16 | $7700.00 | Window Closed / Lapsed |