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:
Nov. 09, 1993
Filed:
Nov. 22, 1991
Valmet Paper Machinery, Inc., Helsinki, FI;
Abstract
An absorptive sound attenuator, which is intended particularly for intake and/or exhaust air ducts in paper mills. The sound attenuator comprises a box-like duct housing (10), in whose interior there is an inner tube (19), which is provided with through perforations (19a) and which forms the air duct (20). Around the inner tube is placed sound absorbing material (21, 22). The inner tube (19) defines the air duct (20) in its interior, the sound being absorbed in the area of the air duct (20). In order to facilitate cleaning and/or replacing of the sound attenuator components and the absorption material (21,22,26) in the duct housing (10) the absorptive sound attenuator is provided with openable outer walls (13a,13b,14a,14b,13A,13B). When these walls are open, the absorption material (21,22,26) can be removed and/or replaced from outside the inner tube (19).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile