Patent US3421485A successfully refreshed from Google Patents.
US3421485A
Expired / Lapsed
US
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Fuel mixing device for internal combustion engines
Assignee: Individual
•
Filing: 1967-06-19
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Granted: 1969-01-14
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Expires: 1987-06-19
Abstract
No abstract record available.
Inventors
- 👤 De Witt M Fessenden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:54
CPC Classifications
F; F02; F02M; F02M29/00; F02M29/02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02M26/00; F02M26/13; F02M26/17; F02M26/36; F02M26/40; F02M26/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US772530A
Cited
US1156716A
Cited
US1529612A
Cited
US2669508A
Cited
US2932495A
Cited
US2969782A
Cited
US3216722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |