US2689552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reed valve for internal-combustion engines
Assignee: Individual
•
Filing: 1950-09-11
•
Granted: 1954-09-21
•
Expires: 1970-09-11
Abstract
No abstract record available.
Inventors
- 👤 Elmer C Kiekhaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:00
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/20; F01; F01L; F01L3/00; F01L3/20; F01L3/205; F02B75/007; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/1804; F02B2075/1808; F02B61/00; F02B61/04; F02B61/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US939549A
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US1022157A
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GB191511881A
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US1494176A
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US1408724A
Cited
US1672436A
Cited
US2065062A
Cited
US2000883A
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US2397457A
Cited
US2459594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |