Patent ID: 9316133
Filing Date: 2016-04-19
CPC Classification: B32B,E04B,F01N,G10K

Claim Text:
1. A rugged noise muffler system configured to substantially surround one or more sound-emitting openings in a working unit or structure, to absorb sound emitted from the sound-emitting openings in order that sound detected at the working unit or structure does not exceed a predetermined level, the system comprising: at least one barrier formed as a housing to cover a sound emitting opening of the working unit or structure to inhibit sound from emanating from the housing, except at an open end of the housing, when sound is emitted from the working unit or structure; wherein the housing includes a hood portion attached to or integral with the housing that receives the sound emitted from the working unit or structure; wherein the housing further includes an elongate portion attached to or integral with the hood portion and which includes the housing open end; wherein inner surfaces of the hood portion and an elongate portion are lined with sound absorbing material; wherein the sound emitted from the sound emitting opening first enters the hood portion travels a first distance and is partially absorbed therein; wherein unabsorbed sound from the hood portion passes into and travels a second distance through the elongate portion and is substantially absorbed therein; and wherein a sound transmission class (STC) of the sound absorbing material lining the hood portion and the elongate portion, and a total distance of the first and the second distance determines a level of the sound emitted at the housing open end.