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:
Apr. 25, 2000
Filed:
Oct. 20, 1995
Stephen P Rittmueller, St. Charles, IL (US);
J Adin Mann, Ames, IA (US);
David K Holger, Ames, IA (US);
Douglas E Johnson, Webster City, IA (US);
Iowa State University Research Foundation, Inc., Ames, IA (US);
White Consolidated Industries, Inc., Cleveland, OH (US);
Abstract
A central vacuum cleaner having an air flow exhaust pipe is provided with a muffler comprising an elongated muffler pipe having a reduced diameter inlet and a reduced diameter outlet and a noise reducing foam liner disposed in the muffler pipe between the inlet and outlet. The foam liner includes a smooth inner surface that is generally flush with inner surfaces of the inlet and outlet. The foam liner comprises a combustion modified polyether polyurethane foam tube inserted in the muffler pipe between the inlet and outlet.