Patent US2970581A successfully refreshed from Google Patents.
US2970581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engines the compression ratio of which is adjustable in operation
Assignee: Individual
•
Filing: 1958-11-12
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Granted: 1961-02-07
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Expires: 1978-11-12
Abstract
No abstract record available.
Inventors
- 👤 Georges Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:31
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/04; F02B75/041; F02B75/042; F02D; F02D15/00; F02D15/04; F02B1/00; F02B1/02; F02B1/04; F02B75/12; F02B2075/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2040652A
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US2120012A
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US2163015A
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US2434151A
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US2316790A
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US2367894A
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FR909061A
Cited
US2500409A
Cited
US2420117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |