Patent US2690168A successfully refreshed from Google Patents.
US2690168A
Expired / Lapsed
US
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Preheating system for engines
Assignee: Daimler Benz AG
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Filing: 1950-01-13
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Granted: 1954-09-28
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Expires: 1970-01-13
Abstract
No abstract record available.
Inventors
- 👤 Friedrich K H Nallinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:18
CPC Classifications
F; F02; F02N; F02N19/00; F02N19/02; F02N19/04; F02N19/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US746289A
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US1266780A
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US1326539A
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US1357598A
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US1372864A
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US1992568A
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US2405143A
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US2405144A
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US2405145A
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US2440369A
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US2399941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-27 | 1958-03-29 | 1958-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-27 | 1962-03-29 | 1962-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-27 | 1966-03-29 | 1966-09-28 | $7700.00 | Window Closed / Lapsed |