Patent US3441771A successfully refreshed from Google Patents.
Patent US3507261A successfully refreshed from Google Patents.
US3507261A
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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: 1969-06-20
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Granted: 1970-04-21
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Expires: 1989-06-20
Abstract
No abstract record available.
Inventors
- 👤 Phillip S Myers
- 👤 Otto A Uyehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:45
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/0203; F02D13/0215; F01; F01L; F01L1/00; F01L1/28; F01L1/34; F01L1/344; F01L1/348; F02B; F02B17/00; F02B47/00; F02B47/04; F02B47/08; F02D13/0257; F02D13/0276; F02D21/00; F02D21/06; F02D21/08; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S60/00; Y10S60/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USRE25578E
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US1494763A
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US1623384A
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US2807250A
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US2884913A
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US3092089A
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US3241536A
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US3315650A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |