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:
May. 15, 2001
Filed:
Sep. 24, 1999
Applicant:
Inventors:
Kazuyuki Hayashi, Hiroshima-ken, JP;
Mineko Ohsugi, Hiroshima-ken, JP;
Hiroko Morii, Hiroshima-ken, JP;
Assignee:
Toda Kogyo Corporation, Hiroshima-ken, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09C 1/22 ;
U.S. Cl.
CPC ...
C09C 1/22 ;
Abstract
A fine red iron oxide pigment of the present invention comprises hematite particles and having a geometrical standard deviation of major axial diameter of not more than 1.5, a geometrical standard deviation of minor axial diameter of not more than 1.3 and an average major axial diameter of 0.005 to 0.1 &mgr;m. Such fine red iron oxide pigment is uniform in both major axial diameter and minor axial diameter thereof and exhibits an excellent transparency.