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:
Oct. 15, 1996
Filed:
Mar. 25, 1994
Shinya Mayama, Yamato, JP;
Yuko Sato, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A two-component type developer for developing an electrostatic image is constituted by a toner and a carrier. The carrier is composed of a magnetic material and a resin either coating or dispersing the magnetic material. The resin comprises a copolymer having structural units of the following formulae [1] and [2]: ##STR1## wherein A denotes a C.sub.1 -C.sub.10 linear, branched or cyclic alkylidene group, aryl-substituted alkylidene group or arylenedialkylidene group, --O--, --S--, --CO--, --SO-- or --SO.sub.2 --; and R.sub.1 -R.sub.4 independently denote hydrogen, halogen, or a C.sub.1 -C.sub.4 alkyl or alkenyl group: ##STR2## wherein R.sub.5 denotes a C.sub.2 -C.sub.6 alkylene or alkylidene group; R.sub.6 and R.sub.7 denote a C.sub.1 -C.sub.3 alkyl group, a phenyl group or a substituted phenyl group; and n is an integer of 1-200.