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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 11422480 B1

PDFFull Text
Date of Patent:
Aug. 23, 2022

Filed:

Mar. 29, 2018

Ferrite carrier core material for electrophotographic developer, ferrite carrier, manufacturing method thereof, and electrophotographic developer using said ferrite

Applicant:

Powdertech Co., Ltd., Kashiwa, JP;

Inventors:

Makoto Ishikawa, Kashiwa, JP;

Hiroki Sawamoto, Kashiwa, JP;

Tetsuya Uemura, Kashiwa, JP;

Assignee:

POWDERTECH CO., LTD., Kashiwa, JP;

Attorney:

Procopio, Cory, Hargreaves & Savitch LLP

Primary Examiner:

Peter L Vajda

Int. Cl.
CPC ...
G03G 9/107 (2006.01); G03G 9/08 (2006.01); G03G 9/083 (2006.01); G03G 9/113 (2006.01);
U.S. Cl.
CPC ...
G03G 9/1075 (2013.01); G03G 9/0819 (2013.01); G03G 9/0823 (2013.01); G03G 9/0833 (2013.01); G03G 9/1085 (2020.08); G03G 9/1133 (2013.01); G03G 9/1136 (2013.01);
Abstract

The present invention provides: a ferrite carrier core material for an electrophotographic developer, the material having a mesh passing amount of 3 wt % or less as indicated by the ratio of the weight of particles passing through a 16 μm-mesh to the weight of whole particles constituting a powder, and having a particle strength index of 2 wt % or less as indicated by a difference between the mesh passing amounts before and after crushing; a ferrite carrier which is for an electrophotographic developer and in which the surface of the ferrite carrier core material is coated with a resin; and an electrophotographic developer which includes the ferrite carrier and a toner.

Find Patent Forward Citations

Ishikawa, Makoto. (2022). Ferrite carrier core material for electrophotographic developer, ferrite carrier, manufacturing method thereof, and electrophotographic developer using said ferrite (U.S. Patent No. 11422480). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/11422480

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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