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:
Jan. 20, 1981
Filed:
Apr. 25, 1977
Applicant:
Inventor:
Takemi Hashimoto, Kawasaki, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ; H04B / ;
U.S. Cl.
CPC ...
179 / ; 364200 ; 371 24 ; 371 30 ; 371 67 ;
Abstract
In a system of transceivers which can automatically operate either in calling or called modes, the identification codes of the calling and called transceivers are transmitted back and forth between them and compared in a manner which tends to minimize erroneous connections and to confirm only correct connections prior to starting the actual transmission of data between the transceivers.