The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 1990
Filed:
Aug. 25, 1989
Thomas R Norris, Orinda, CA (US);
Other;
Abstract
This invention provides an improved method and apparatus for attenuating the sound of flowing fluid. The apparatus of this invention includes at least two attenuating areas, preferably particle-filled containers arranged serially within a housing. One of the attenuating areas has a central void into which a portion of the fluid may flow on its way through the muffler. The muffler may also include a mechanism for permitting one of the attenuating devices to move in order to accommodate changes in fluid pressure. The method includes the steps of introducing a pressurized fluid into first flow resisting means disposed within a housing; passing all of the fluid from the first speed dissipating means into a first void disposed within the housing; splitting the flow in the first void into first and second subflows; passing the first subflow from the first void into a second flow resisting means disposed within the housing; passing the first subflow out of the housing; and passing the second subflow from the first void out of the housing without passing into the second speed dissipating means.