US3457723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust system
Assignee: Walker Manufacturing Co
•
Filing: 1965-03-22
•
Granted: 1969-07-29
•
Expires: 1985-03-22
Abstract
No abstract record available.
Inventors
- 👤 Karl K Kerns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:52
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/14; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N2470/00; F01N2470/20; F02; F02D; F02D9/00; F02D9/02; F02D2009/0201; F02D2009/024; F02M; F02M26/00; F02M26/13; F02M26/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1459797A
Cited
US2308059A
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US2747976A
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US3090463A
Cited
US3043094A
Cited
US3133612A
Cited
US3252767A
Cited
US3276540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |