Patent US2670726A successfully refreshed from Google Patents.
US2670726A
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US
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Internal-combustion engine, piston for use therein, and method of operating same
Assignee: Barnes and Reinecke Inc
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Filing: 1950-05-09
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Granted: 1954-03-02
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Expires: 1970-05-09
Abstract
No abstract record available.
Inventors
- 👤 Ernst W Spannhake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:00
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/0015; F02F3/0023; F02F3/16; F02F3/20; F02F3/22; F05; F05C; F05C2201/00; F05C2201/04; F05C2201/0433; F05C2201/0448
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1978816A
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US2447508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |