US2716969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-or liquid-cooled cylinder head for internal combustion engines
Assignee: Durex S A
•
Filing: 1952-07-19
•
Granted: 1955-09-06
•
Expires: 1972-07-19
Abstract
No abstract record available.
Inventors
- 👤 Lang Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:56
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/26; F02F1/36; F02F1/38; F02B; F02B3/00; F02B3/06; F02F2001/244; F02F2001/247
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1180983A
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FR572261A
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FR570623A
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US1756337A
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DE567828C
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FR777841A
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FR807344A
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AT165232B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-05 | 1959-03-07 | 1959-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-05 | 1963-03-07 | 1963-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-05 | 1967-03-07 | 1967-09-06 | $7700.00 | Window Closed / Lapsed |