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:
Oct. 21, 1980
Filed:
Feb. 12, 1979
Oskar Bschorr, Munich, DE;
Messerschmitt-Bolkow-Blohm GmbH, Munich, DE;
Abstract
The present variable volume resonators have an inner volume enclosed by wall members constructed as Belleville springs. The wall members confine in said volume a pressure which is reduced relative to atmospheric pressure, whereby the springs have a small spring constant in response to a reduced pressure load. Each resonator is so constructed that it has a relatively large resonating surface and a relatively low resonating mass. The sound damping effect of the resonator volume is enhanced by means of various types of damping devices including a high viscosity residual gas, wire mesh members, or liquid drops in the volume interior. The present resonators also comprise features for compensating air pressure and/or the resonance frequency.