Patent US2901052A successfully refreshed from Google Patents.
US2901052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tractor engine cooling and exhaust system
Assignee: Dr Ing HCF Porsche AG
•
Filing: 1954-11-16
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Granted: 1959-08-25
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Expires: 1974-11-16
Abstract
No abstract record available.
Inventors
- 👤 Rabe Karl
- 👤 Forstner Egon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:02
CPC Classifications
F; F01; F01P; F01P5/00; F01P5/02; F01P5/08; B; B62; B62D; B62D49/00; F01N; F01N5/00; F01N2590/00; F01N2590/08; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S180/00; Y10S180/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE882040C
Cited
US862250A
Cited
GB191417088A
Cited
US1560351A
Cited
US2091496A
Cited
US2187425A
Cited
US2390218A
Cited
US2702438A
Cited
US2701024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |