Patent US2444254A successfully refreshed from Google Patents.
US2444254A
Expired / Lapsed
US
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Engine-driven shaft govering apparatus
Assignee: Westinghouse Air Brake Co
•
Filing: 1942-11-28
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Granted: 1948-06-29
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Expires: 1962-11-28
Abstract
No abstract record available.
Inventors
- 👤 Ellis E Hewitt
- 👤 Claude M Hines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:00
CPC Classifications
G; G05; G05D; G05D13/00; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0801; Y10T137/0971; Y10T137/0989
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-29 | 1951-12-29 | 1952-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-29 | 1955-12-29 | 1956-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-29 | 1959-12-29 | 1960-06-29 | $7700.00 | Window Closed / Lapsed |