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:
Aug. 02, 2022
Filed:
Jun. 26, 2018
3m Innovative Properties Company, St. Paul, MN (US);
Seungkyu Lee, Woodbury, MN (US);
Thomas P. Hänschen, Mendota Heights, MN (US);
Jonathan H. Alexander, Roseville, 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 are conduits for air flow that are capable of reducing noise and related methods. The provided conduits include a first section that is tubular and substantially non-perforated and a second section with at least a portion having a multiplicity of microperforations that provide an average flow resistance of from 50 MKS Rayls to 8000 MKS Rayls therethrough. The second section is either (a) tubular and connected in series with the first section, with an outer surface of the second section being in fluid communication with an outer surface of the conduit, or (b) disposed within the first section.