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.:

US 7907855 B1

Expired

Date of Patent:

Mar. 15, 2011

Filed:

Feb. 13, 2008

Image forming apparatus

Applicant:

Masanori Akita, Toride, JP;

Inventor:

Masanori Akita, Toride, JP;

Assignee:

Canon Kabushiki Kaisha, Tokyo, JP;

Attorney:

Fitzpatrick, Cella, Harper & Scinto

Primary Examiner:

David M Gray

Assistant Examiner:

Francis Gray

Int. Cl.

CPC ...

G03G 15/00 (2006.01); G03G 15/06 (2006.01); G03G 15/09 (2006.01); G03G 15/08 (2006.01);

U.S. Cl.

CPC ...

Abstract

An image forming apparatus including a first developing device including a first developer carrying member for carrying a developer containing toner, wherein a developing voltage including an AC component is applicable to the first developer carrying member to develop an electrostatic image; a second developing device including a second developer carrying member for carrying a developer containing toner, wherein a developing voltage including an AC component is applicable to the second developer carrying member to develop an electrostatic image; a transferring device for transferring a toner image formed by the first developing device to a moving transfer medium and then transferring a toner image formed by the second developing device onto the transfer medium; a controller for selectively executing an operation in a first mode wherein the image is formed by both of the first developing device and the second developing device or in a second mode wherein the image is formed by only the second developing device of the developing devices; wherein the second developing device is capable of developing operation with the developing voltage having the AC component which is smaller in amplitude in the first mode than in the second mode.

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Akita, Masanori. (2011). Image forming apparatus (U.S. Patent No. 7907855). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7907855

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