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. 19, 1991
Filed:
Jun. 01, 1990
Akihito Hosaka, Yokohama, JP;
Koichi Kinoshita, Shizuoka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A method and apparatus for development. A layer of developer which is a mixture of insulative magnetic particles and toner particles is carried on a surface of a developing sleeve which accommodates therein a magnet roller. A latent image bearing member carrying a latent image to be developed is so opposed to the developing sleeve that the latent image bearing member to a portion of the magnet roller which is between the two adjacent magnetic poles. The surfaces of the latent image bearing member and the developer carrying member are maintained with a clearance which is larger than the thickness of the developer layer. An alternating electric field is formed in or across the clearance to alternatingly repeat two steps, i.e., a toner transferring step wherein the toner particles are transferred from the developer layer on the developer carrying sleeve to the latent image bearing member, irrespective of whether it is the image area or whether it is non-image area, and a back transfer step wherein excessive toner particles are transferred back to the developer carrying member, whereby a developer image is provided.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile