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:
Jul. 11, 1995
Filed:
Sep. 29, 1993
Kazuo Hashimoto, Tokyo, JP;
Hashimoto Corporation, Tokyo, JP;
Abstract
This device is designed so that although voice of the opposite party will be amplified when telephone 1 on the side of the device is first placed on-hook during a telephone conversation, amplification will not occur if the opposite party places his or her phone on-hook first during a telephone conversation or if the user places telephone 1 on-hook before the opposite party picks up the telephone. The structure, which is shown in FIG. 1 such that during a telephone conversation between telephone 1 and telephone 12, when telephone 1 is placed on-hook first, the on-hook status is detected by means of the photocouplers PC-1 or PC-2, and the voice of the opposite party at telephone 12 is amplified by means of contacts y1-1 and y1-2, which are in the make position, line transformer 2, amplifier 3 and speaker 4. Further, when the opposite party's telephone 12 is placed on-hook first, the voice of the opposite party will not be amplified because a reversal of polarity and a brief disconnection on telephone line 13 are detected by means of photocouplers PC-1 and PC-2.