US3431898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for use with an internal combustion engine for reducing air pollution
Assignee: Individual
•
Filing: 1967-02-01
•
Granted: 1969-03-11
•
Expires: 1987-02-01
Abstract
No abstract record available.
Inventors
- 👤 Tommy Driscoll
- 👤 Homer Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:13
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/04; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US417127A
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US3145697A
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US2043298A
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US2087688A
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US2604958A
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US2442696A
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US2910717A
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US3002870A
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US3224118A
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US3263402A
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US3272192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-10 | 1972-09-09 | 1973-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-10 | 1976-09-09 | 1977-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-10 | 1980-09-09 | 1981-03-11 | $7700.00 | Window Closed / Lapsed |