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:
Jul. 16, 2019
Filed:
Sep. 09, 2015
3m Innovative Properties Company, St. Paul, MN (US);
Thomas P. Hanschen, Mendota Heights, MN (US);
Jonathan H. Alexander, Roseville, MN (US);
Paul A. Martinson, Maplewood, MN (US);
John Stuart Bolton, Lafayette, IN (US);
Seungkyu Lee, Woodbury, MN (US);
Thomas Herdtle, Inver Grove Heights, MN (US);
Ronald W. Gerdes, St. Paul, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Provided acoustic devices include an external housing defining an expansion chamber and a wall extending through and partitioning the expansion chamber into a central chamber and a peripheral chamber adjacent the central chamber, wherein an inlet and outlet communicate with the central chamber, and wherein the wall includes a plurality of apertures formed therethrough to allow air movement to and from the central and expansion chambers, the plurality of apertures sized to provide an average flow resistance ranging from 100 MKS Rayls to 5000 MKS Rayls. The acoustic devices advantageously show significant sound attenuation while streamlining air flow to reduce pressure drop across the expansion chamber.