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:
Dec. 04, 1990
Filed:
Aug. 18, 1989
Kiichiro Sakashita, Inagi, JP;
Yasuo Iwahashi, Kashiwa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Magnetic iron oxide containing silicon element is produced in the form of generally octahedral particles having a sharp particle size distribution through a reaction of an aqueous solution of a ferrous salt having a controlled Fe(II)/Fe(III) ratio and containing a silicic compound with a little excess of an alkali, followed by oxidation of the resultant ferrous hydroxide. The magnetic iron oxide particles have an overall content of silicon element of 0.1-1.5 wt. % based on the iron element with the silicon localized at the core of the particles. The magnetic iron oxide particles have uniform surface properties not markedly changed under various conditions and have good dispersibility in a resin.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile