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:
Apr. 14, 1981
Filed:
Mar. 01, 1979
Abstract
A method for manufacturing magnetically attractive toner particles utilized for developing electrostatic latent images includes a first step of thermally kneading a mixture of a first resin material and minute particles of magnetizable material, and a second step of thermally kneading, with a second resin material having a higher softening temperature and/or a physically harder nature being further added at the same time, so that a mixture of these three materials, as a whole, is to constitute a composite material having a specific crushing nature. The composite material thus treated is consequently solidified, and then crushed, to form the toner particles, whereby minute particles of magnetizable material comprising each toner particle are respectively to be exposed from an outer boundary of the toner particle.