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, 1989
Filed:
May. 21, 1987
Applicant:
Inventor:
Sayling Wen, Taipei, TW;
Assignee:
Inventa Electronics Co., Ltd., Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379199 ; 379375 ;
Abstract
This invention provides a central processing unit having read only memory for storing permanently the firmware and random access memory for storing the protocol which can be changed by user via the keyboard when need, which also has a detector for counting the ring signal inputted from the line and sending it to the CPU. When the count of the ring signal and the interval between the hang-up and dial are all met, the protocol stored in the RAM of the CPU and the control device enabled by the CPU via the output terminal send the tone signal to the ring apparatus for signaling the user.