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Patent US2821174A successfully refreshed from Google Patents.
US2821174A
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Appliance for the ventilation of the crankcase of internal combustion engines
Assignee: Hoval AG
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Filing: 1955-05-27
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Granted: 1958-01-28
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Expires: 1975-05-27
Abstract
No abstract record available.
Inventors
- 👤 Scheiterlein Andreas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:58
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/04; F01M13/0416; F01M13/0405; F01M11/00; F01M11/04; F01M13/0033; F01M2011/0491; F02; F02F; F02F7/00; F02F7/0065; F02F7/0073; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2186
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE415490C
Cited
US1299129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |