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:
Jul. 25, 2000
Filed:
Jun. 30, 1998
Seiji Nakagome, Ibaraki-ken, JP;
Akihiko Toda, Ibaraki-ken, JP;
NOK Corporation, Tokyo, JP;
Abstract
A phenylenediamine derivative represented by following formula (I) or (II): ##STR1## wherein R.sub.1 and R.sub.2 each represents a hydrogen atom, a lower alkyl group, or a lower alkoxy group; R.sub.3 represents a hydrogen atom or a methyl group; R.sub.4 represents a methyl group or an ethyl group; and n and m each is 1, 2, or 3; ##STR2## wherein R.sub.1 and R.sub.2 each represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, or a cyano group; and n and m each is 1, 2, or 3, is disclosed. These phenylenediamine derivatives are effectively used as antioxidants for rubbers, which scarcely cause vanishing by evaporation or a thermal denaturation even under a high-temperature condition of 150.degree. C. or higher.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile