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:
Sep. 24, 1991
Filed:
Feb. 27, 1990
Keiji Nakanishi, Takatsuki, JP;
Yasuyuki Sekiguchi, Ibaraki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A silencer for refrigerators includes a microphone for detecting noise produced by a compressor disposed in a machine compartment and converting the noise to an electrical signal, a signal converter converting the electrical signal generated by the microphone to a corresponding sound wave signal suitable for deadening the noise from the compressor by the effect of the sound wave interference, a speaker driven in response to the sound wave signal generated by the signal converter such that the sound is directed to the interior of the machine compartment of the refrigerator, a storage for previously storing data of noise patterns of the compressor in the abnormal condition of an evaporator as reference patterns, and a control comparing the electrical signal generated by the microphone with the data of the reference noise patterns stored in the storage, thereby determining as to whether or not the evaporator is abnormal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile