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:
Aug. 20, 1991
Filed:
Jul. 31, 1989
Applicant:
Inventor:
Sung-Taek Kim, Kumi, KR;
Assignee:
SamSung Electronics Co., Ltd., Kyung Ki-Do, KR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379165 ; 379412 ; 379413 ;
Abstract
There is disclosed a resetting circuit of a key telephone system (KTS) capable of preventing data error caused by unstable power supply and instantaneous power-off of a key system unit (KSU), by adjusting a DC voltage of the key telehpone system, said DC voltage is applied to a reset terminal of a microprocessor in the key telephone system. The invention includes a power supply for supplying power to the KSU and KTS, a microprocessor for controlling the overall operation of the KTS, a first detecting means for detecting the voltage change of a first voltage Vcc1, and a second detecting means for detecting the voltage change of a second voltage Vcc2.