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:
Dec. 27, 1988
Filed:
Feb. 24, 1987
Applicant:
Inventor:
Kou-I Yeh, Taipei, TW;
Assignee:
Inventa Electronics Co., Ltd., Taipei, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379388 ; 379160 ; 379412 ;
Abstract
A switching control apparatus for intercom-telephone sets includes a switching control circuit and a surge protection circuit electrically coupled with a talking circuit for increasing the reliability of the intercom-telephone operation, reducing the cost of manufacturing the product and protecting the intercom-telephone sets against high voltage surges which may damage the intercom-telephone sets during electrical storms.