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. 26, 1999
Filed:
Aug. 08, 1995
Chemitech, Inc., Tokyo, JP;
Abstract
Gelatin microcapsules for magnetic display enclosing therein dispersion medium, magnetic powder and nonmagnetic powder, characterized in that that the dispersion medium in the microcapsules is composed of at least low boiling point solvent, particle diameter of the microcapsules is ion a range of 400 .mu.m tap 800 .mu.m and particles bigger than average are removed out. And solvents with boiling point higher than 175 .degree. C., dispersant and suspension are contained in the dispersion medium, magnetic powder and nonmagnetic powder are affinity-treated. The microcapsule magnetic display sheet is produced by coating the above-described microcapsules. Therefore, recording speed and erasing speed are fast and recorded words or pictures are clear even if a magnetic force lower than 1100 gauss is used.