US2558867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door operating mechanism
Assignee: Westinghouse Air Brake Co
•
Filing: 1949-09-24
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Granted: 1951-07-03
•
Expires: 1969-09-24
Abstract
No abstract record available.
Inventors
- 👤 Harry C May
- 👤 Ellis E Hewitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:03
CPC Classifications
F; F02; F02C; F02C3/00; E; E05; E05F; E05F15/00; E05F15/50; E05F15/53; F02C3/20; F02C3/26
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) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |