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. 21, 2008
Filed:
Sep. 16, 2005
Tomoyuki Hoshino, Tamano, JP;
Koichi Katsuyama, Tamano, JP;
Shoichi Fujiyasu, Tamano, JP;
Takashi Nakashima, Tamano, JP;
Tomoyuki Hoshino, Tamano, JP;
Koichi Katsuyama, Tamano, JP;
Shoichi Fujiyasu, Tamano, JP;
Takashi Nakashima, Tamano, JP;
Mitsui Mining & Smelting Co., Ltd., Tokyo, JP;
Abstract
Disclosed is a black pigment having adequate degree of blackness and high electrical resistance at the same time. Specifically disclosed is a granular black pigment containing cobalt which is characterized in that it is composed of an oxide containing at least cobalt and the divalent cobalt content accounts for 40-70% of the total cobalt content. It is preferable that the total cobalt content in a whole particle is 60-80% by mass, and the divalent cobalt content in a whole particle is 20-50% by mass. It is also preferable that the primary particle diameter is 0.02-0.6 μm.