Patent US3338682A successfully refreshed from Google Patents.
US3338682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler secondary air silencer
Assignee: Walker Manufacturing Co
•
Filing: 1964-12-14
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Granted: 1967-08-29
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Expires: 1984-12-14
Abstract
No abstract record available.
Inventors
- 👤 Charles P Fowler
- 👤 Ervin C Lentz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:17
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/22; F01N3/222; F01N3/20; F01N3/2053; F01N3/24; F01N3/30; F01N3/32; F01N3/34; F01N2270/00; F01N2410/00; F01N2410/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
46 words
IN A MOTOR VEHICLE HAVING AN INTERNAL COMBUSTION ENGINE, AN EXHAUST SYSTEM FOR THE ENGINE INCLUDING A VENTURI FOR ASPIRATING SECONDARY AIR, A PLENUM CHAMBER AROUND THE VENTURI, A TUNING SHELL IN THE CHAMBER AROUND THE VENTURI TO SILENCE THE EXHAUST SYSTEM, AN INLET IN THE
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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) | 1970-08-28 | 1971-02-27 | 1971-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-28 | 1975-02-27 | 1975-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-28 | 1979-02-27 | 1979-08-29 | $7700.00 | Window Closed / Lapsed |