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:
Mar. 10, 1998
Filed:
Jul. 05, 1996
Byeong-Kuk Lee, Gumi, KR;
SamSung Electronics Co., Ltd., Kyungki-do, KR;
Abstract
A parallel-connected telephone use determining circuit using a microcomputer having therein an analog-to digital converter for determining an operation status of a parallel-connected telephone system connected to a telephone line. The circuit includes a rectifier for rectifying the variance of voltage applied through a telephone line, a voltage detector for detecting the variance of the voltage rectified from the rectifier, and a central processing unit (CPU) having an A/D converter incorporated therein for converting the voltage variance output from the voltage detector into a digital signal, for detecting the digital signal converted from the A/D converter and determining whether a parallel-connected telephone is in use.