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:
Feb. 18, 1992
Filed:
Jul. 12, 1989
Applicant:
Inventors:
Hans-Hermann Potthoff, Heidelberg-Kirchheim, DE;
Ingolf Scheffler, Wiesloch, DE;
Klaus Ruch, Wiesloch/Baiertal, DE;
Rainer Joesel, Karlsruhe, DE;
Assignee:
E.A.P. Akustik GmbH, Heidelberg, DE;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E04B / ; E04B / ;
U.S. Cl.
CPC ...
181290 ; 181291 ; 181294 ;
Abstract
A mass and spring system for soundproofing, particularly in vehicles, comprises a bending-soft heavy plastic layer as the mass and a soft layer as the spring, which is applied to the sound radiating surface or wall and which is a gel of 10 to 50% by weight of an organic polymer or silicone polymer and 50 to 90% by weight of a plasticizer compatible therewith, which at room temperature has a modulus of elasticity E'.ltoreq.5.times.10.sup.5 Pa and an internal loss factor d.gtoreq.0.5.