Patent US2145651A successfully refreshed from Google Patents.
Patent US2033019A successfully refreshed from Google Patents.
US2033019A
Expired / Lapsed
US
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Auxiliary air inlet
Assignee: Individual
•
Filing: 1933-09-18
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Granted: 1936-03-03
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Expires: 1953-09-18
Abstract
No abstract record available.
Inventors
- 👤 Weinmann Curt
- 👤 Frank L Macdonough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:58
CPC Classifications
F; F02; F02M; F02M21/00; F02M2700/00; F02M2700/13; F02M2700/1305
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) | 1939-03-03 | 1939-09-02 | 1940-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-03-03 | 1943-09-02 | 1944-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-03-03 | 1947-09-02 | 1948-03-03 | $7700.00 | Window Closed / Lapsed |