Patent US2431859A successfully refreshed from Google Patents.
US2431859A
Expired / Lapsed
US
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Two-cycle engine, crankcase compression, valve piston
Assignee: Individual
•
Filing: 1945-06-28
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Granted: 1947-12-02
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Expires: 1965-06-28
Abstract
No abstract record available.
Inventors
- 👤 Fisher Reginald John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:21
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)
US1413912A
Cited
US741559A
Cited
US803078A
Cited
US1107501A
Cited
US1010754A
Cited
GB191204443A
Cited
US1333635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |