US2575994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control switch
Assignee: Westinghouse Air Brake Co
•
Filing: 1948-01-13
•
Granted: 1951-11-20
•
Expires: 1968-01-13
Abstract
No abstract record available.
Inventors
- 👤 Herbert L Bone
- 👤 Glen V Jefferson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:40
CPC Classifications
B; B61; B61L; B61L5/00; B61L5/10; B61L5/107; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1569713A
Cited
US1466606A
Cited
US1725635A
Cited
US1848349A
Cited
US2175562A
Cited
US1997624A
Cited
GB450142A
Cited
US2083288A
Cited
GB440554A
Cited
US2092614A
Cited
US2289643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |