Patent US2183939A successfully refreshed from Google Patents.
US2183939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling valve for air-controlled
Assignee: —
•
Filing: —
•
Granted: 1939-12-19
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Expires: 1956-12-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:53
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/36; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T74/00; Y10T74/12; Y10T74/1229; Y10T74/1232; Y10T74/1239
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) | 1942-12-18 | 1943-06-19 | 1943-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-12-18 | 1947-06-19 | 1947-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-12-18 | 1951-06-19 | 1951-12-19 | $7700.00 | Window Closed / Lapsed |