Patent US2669979A successfully refreshed from Google Patents.
US2669979A
Expired / Lapsed
US
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Reed valve unit for crankcase induction engines
Assignee: Individual
•
Filing: 1950-09-11
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Granted: 1954-02-23
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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 06:37
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; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7843
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |