US3404750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination tailpipe spout and silencer
Assignee: Walker Manufacturing Co
•
Filing: 1966-07-14
•
Granted: 1968-10-08
•
Expires: 1986-07-14
Abstract
No abstract record available.
Inventors
- 👤 Walter H Powers
- 👤 Gene M Neff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:21
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/02; F01N1/00; F01N1/003; F01N13/08; F01N13/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2205024A
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US2189425A
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US2367753A
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GB679940A
Cited
US2808896A
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GB892780A
Cited
US3219142A
Cited
CH397331A
Cited
FR1351921A
Cited
US3196976A
Cited
US3263772A
Cited
US3259206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |