Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2007-07-24
2007-07-24
Sircus, Brian (Department: 2836)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C181S273000, C180S296000
Reexamination Certificate
active
10883168
ABSTRACT:
A sound dampening assembly adapted to engage an exhaust pipe in an automotive engine exhaust system adjacent an outlet of an internal combustion engine. The assembly includes a bottle portion having a single opening and an interior defining a predetermined amount of volume and a neck portion having a first end attached to the opening of the bottle portion and extending from the bottle portion. The neck portion is in fluid communication with the bottle portion interior and includes a second end adapted to be attached to the exhaust pipe. The neck portion has an interior defining a predetermined amount of volume and the bottle portion and the neck portion are sized to attenuate vibration at a predetermined frequency in the exhaust system.
REFERENCES:
patent: 3505028 (1970-04-01), Douthit
patent: 4408675 (1983-10-01), Keller
patent: 4779415 (1988-10-01), Richardson et al.
patent: 5283398 (1994-02-01), Kotera et al.
Kurzawa Andrew J
Osterkamp Dale F.
General Motors Corporation
Sircus Brian
Willoughby Terrence R.
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