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Patent US3498406A successfully refreshed from Google Patents.
US3498406A
Expired / Lapsed
US
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Triflow muffler for exhaust gases
Assignee: Walker Manufacturing Co
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Filing: 1967-09-26
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Granted: 1970-03-03
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Expires: 1987-09-26
Abstract
No abstract record available.
Inventors
- 👤 Robert A Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:49
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/003; F01N1/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1051130A
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US1131233A
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US1338520A
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US1553264A
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FR625942A
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US2109220A
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US2675088A
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US3036655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |