Patent US2616403A successfully refreshed from Google Patents.
US2616403A
Expired / Lapsed
US
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Valve unit for internal-combustion engines
Assignee: Individual
•
Filing: 1948-07-29
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Granted: 1952-11-04
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Expires: 1968-07-29
Abstract
No abstract record available.
Inventors
- 👤 Kiekhaefer Elmer Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:50
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/007; F01; F01L; F01L3/00; F01L3/20; F01L3/205; F02B75/02; F02B2075/022; F02B2075/025; F02B61/00; F02B61/04; F02B61/045; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/7888; Y10T137/7891; Y10T137/7892
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) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |