In-line noise attenuation device for a gas conduit
Patent 4936413 Issued on June 26, 1990. Estimated Expiration Date: 
July 10, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 10, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2671523 3888332 Exhaust silencers Muffler for exhaust gases Engine air cleaner - noise reducer Patent #: 4782912 InventorAssigneeApplicationNo. 377672 filed on 07/10/1989US Classes:181/264, With baffle or baffle structure181/229, Carburetor, burner, or compressor intake silencer181/265RetrovertedExaminersPrimary: Fuller, Benjamin R.Attorney, Agent or FirmInternational ClassF01N 001/08AbstractAn in-line noise attenuation device for insertion into a gas induction system, such as the air induction system of an automotive vehicle internal combustion engine. The device comprises two plastic parts snap-fitted together. One part is an outer tube, and the other part, an insert disposed within the first part. The insert comprises a hollow ogival-shaped section that is axially coextensive with a frusto-conically shaped section of the outer tube to form an annular flow path of substantially constant cross section for the inducted air. The flow then passes through apertures in the insert to enter a venturi section. The flow continues through the venturi section and then exits the device. The venturi section serves to choke noise that propagates from the engine in the direction opposite the direction of airflow. The noise is reflected back to the engine by the hollow interior of the ogival-shaped section which is open toward the venturi section. | |
