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. 15, 1983
Filed:
Sep. 18, 1980
Leonard P Frieder, Jr, Dalton, PA (US);
Gentex Corporation, Carbondale, PA (US);
Abstract
A local external communication system for use with an enclosed helmet and mask assembly covering the head, ears, nose and mouth of the wearer and provided with earphones and a microphone and a plug for connection with a radio or intercom system, in which a housing adapted to be carried on a wearer's body houses a battery, a speaker and a microphone and carries a receptacle for receiving the communications plug of the mask and helmet assembly. The device includes a unity gain amplifier system having a peak limiting circuit associated with the microphone to limit amplification of external sounds to a safe level. A switch permits the wearer selectively to turn the device off, to listen only, or to both speak and listen through the device.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile