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. 03, 1990
Filed:
Jul. 25, 1988
Applicant:
Inventors:
Assignee:
Bayer Aktiensegellschaft, Leverkusen-Bayerwerk, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09C / ;
U.S. Cl.
CPC ...
106413 ; 106418 ; 106439 ; 106456 ;
Abstract
Improved iron oxide pigments useful in the manufacture of magnetic recording carriers or for coloring inorganic or organic materials are iron oxide pigments having an iron (II) content of at least 5% by weight calculated as FeO after-treated with a phenolic compounds of the formula ##STR1## wherein X is O or NH, and