Patent US2673554A successfully refreshed from Google Patents.
US2673554A
Expired / Lapsed
US
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Method of operating spark ignition engines
Assignee: DIESEL POWER Inc
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Filing: 1950-02-13
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Granted: 1954-03-30
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Expires: 1970-02-13
Abstract
No abstract record available.
Inventors
- 👤 Fred A Thaheld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:17
CPC Classifications
F; F02; F02B; F02B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB180800A
Cited
GB341638A
Cited
US2076030A
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US2000225A
Cited
GB362146A
Cited
US1998978A
Cited
US1954083A
Cited
US2036253A
Cited
US2098031A
Cited
US2457652A
Cited
US2534322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |