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:
Feb. 26, 1991
Filed:
Jan. 08, 1990
Applicant:
Inventor:
Kazuhiro Mizude, Osaka, JP;
Assignee:
Mita Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
355205 ; 355308 ; 340679 ; 364550 ;
Abstract
A control device in an image forming apparatus whose main body is connected to one or more options through two-way serial lines having feeding and receiving lines, can determine whether the main body of the image forming apparatus and each of the options are not connected or not, or the power supply of the option is off or not on the basis of determination whether a signal level on the receiving serial line is a reference level or less or more over a predetermined constant time period if a response signal from the option is not sent back to the main body and correspondingly, can automatically subject the option to suitable control processing.