Patent US1999237A successfully refreshed from Google Patents.
US1999237A
Expired / Lapsed
US
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Lubricant cooling means for internal combustion engines
Assignee: Pratt and Whitney Aircraft Co
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Filing: 1931-01-19
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Granted: 1935-04-30
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Expires: 1951-01-19
Abstract
No abstract record available.
Inventors
- 👤 Leonard S Hobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:51
CPC Classifications
F; F16; F16N; F16N39/00; F16N39/02; F01; F01M; F01M5/00; F01M5/002
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) | 1938-04-29 | 1938-10-29 | 1939-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-29 | 1942-10-29 | 1943-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-29 | 1946-10-29 | 1947-04-30 | $7700.00 | Window Closed / Lapsed |