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:
Nov. 16, 1999
Filed:
Dec. 01, 1997
Applicant:
Inventors:
Bar-Chung Hwang, Taoyuan, TW;
Jizoo Lin, Hsinchu, TW;
Assignee:
Winbond Electronics Corp., , TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379382 ; 379372 ;
Abstract
A device for identifying a line reversal signal and a ringing signal of a telephone set having a built-in ringing detection circuit includes a counter, a comparator and a latch connected with each other in series. The device can determine whether a signal on line is the line reversal signal or the ringing signal of the telephone set without using an installed CPU or a timer thereof, so as to save power and reduce the load of the CPU.