Patent US2420969A successfully refreshed from Google Patents.
US2420969A
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US
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Hot journal alarm apparatus
Assignee: Westinghouse Air Brake Co
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Filing: 1944-06-09
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Granted: 1947-05-20
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Expires: 1964-06-09
Abstract
No abstract record available.
Inventors
- 👤 George K Newell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:14
CPC Classifications
B; B61; B61L; B61L1/00; B61L1/20; Y; Y10; Y10S; Y10S116/00; Y10S116/38
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) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |