Patent US2274767A successfully refreshed from Google Patents.
Patent US3494336A successfully refreshed from Google Patents.
US3494336A
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Method and apparatus for reducing exhaust emissions and improving fuel utilization in internal combustion engines
Assignee: OTTO A UYEHARA
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Filing: 1967-02-10
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Granted: 1970-02-10
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Expires: 1987-02-10
Abstract
No abstract record available.
Inventors
- 👤 Phillip S Myers
- 👤 Otto A Uyehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:52
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F01; F01L; F01L1/00; F01L1/28; F01L1/34; F01L1/344; F01L1/348; F02B; F02B17/00; F02B53/00; F02B2053/005; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B2730/00; F02B2730/01; F02B2730/018; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1819743A
Cited
US794859A
Cited
US1494763A
Cited
US1542476A
Cited
US1657108A
Cited
US3237615A
Cited
US3359958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |