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:
Mar. 17, 2009
Filed:
Apr. 01, 2008
Tetsuo Yamanaka, Tokyo, JP;
Kazuhiko Kobayashi, Tokyo, JP;
Tadashi Shinohara, Kanagawa-ken, JP;
Jun Hosokawa, Tokyo, JP;
Tetsuo Yamanaka, Tokyo, JP;
Kazuhiko Kobayashi, Tokyo, JP;
Tadashi Shinohara, Kanagawa-ken, JP;
Jun Hosokawa, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A color image forming apparatus including a plurality of image forming devices attachable to and detachable from a housing, a transfer device including a transfer belt, an exchange detecting device configured to detect exchange of the image forming devices, a test pattern forming device configured to form, on the transfer belt, a test pattern including a plurality of marks formed by the image forming devices, when the exchange detecting device detects an exchange of the image forming device, an optical sensor configured to read the plurality of marks, and a checking device configured to determine whether reading by the optical sensor is performed correctly or not.