US2497948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic engine-warming mechanism
Assignee: ROBERT H HOLMES
•
Filing: 1948-10-23
•
Granted: 1950-02-21
•
Expires: 1968-10-23
Abstract
No abstract record available.
Inventors
- 👤 Carl E Lincoln
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:32
CPC Classifications
F; F02; F02N; F02N19/00; F02N19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1269637A
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US1409736A
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US1507300A
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US1544350A
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US1719049A
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US1992568A
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US2051240A
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US2222568A
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US2400216A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |