Patent US2250200A successfully refreshed from Google Patents.
US2250200A
Expired / Lapsed
US
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Crankcase ventilating system
Assignee: Donaldson Co Inc
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Filing: 1938-05-27
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Granted: 1941-07-22
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Expires: 1958-05-27
Abstract
No abstract record available.
Inventors
- 👤 Wilfred W Lowther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:50
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/02; F01M13/021; F01M13/022; F01M13/025
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) | 1944-07-21 | 1945-01-20 | 1945-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-21 | 1949-01-20 | 1949-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-21 | 1953-01-20 | 1953-07-22 | $7700.00 | Window Closed / Lapsed |