US2239657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control valve mechanism
Assignee: Baldwin Locomotive Works
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Filing: 1937-10-29
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Granted: 1941-04-22
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Expires: 1957-10-29
Abstract
No abstract record available.
Inventors
- 👤 Myer N Stadlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:09
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; Y; Y10; Y10S; Y10S74/00; Y10S74/02; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-04-21 | 1944-10-21 | 1945-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-21 | 1948-10-21 | 1949-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-21 | 1952-10-21 | 1953-04-22 | $7700.00 | Window Closed / Lapsed |