Patent US3723843A successfully refreshed from Google Patents.
US2549482A
Expired / Lapsed
US
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Internal-combustion engine
Assignee: Individual
•
Filing: 1949-01-13
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Granted: 1951-04-17
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Expires: 1969-01-13
Abstract
No abstract record available.
Inventors
- 👤 Elmer C Kiekhaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:39
CPC Classifications
F; F02; F02B; F02B25/00; F02B2720/00; F02B2720/13; F02B2720/133
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1513335A
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US1591032A
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US1733361A
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US1876956A
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US2069315A
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US2177199A
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US2333419A
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US2270597A
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US2438669A
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US2459594A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |