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:
Jun. 19, 1990
Filed:
Apr. 14, 1989
Applicant:
Inventors:
Assignees:
Showa Denko Kabushiki Kaisha, Tokyo, JP;
Yamaguchi Seiken Kogyo Kabushiki Kaisha, Aichi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B24D / ;
U.S. Cl.
CPC ...
51309 ; 51293 ; 51303 ; 106-3 ;
Abstract
An effective abrasive composition is provided for polishing a plastic article, particularly a plastic lens, to give a mirror surface thereto. This abrasive composition comprises water, an aluminous abrasive and at least one polishing accelerator selected from the group consisting of aluminum oxalate and aluminum lactate, optionally with at least one sedimentation preventing agent selected from the group consisting of crystalline cellulose and colloidal alumnia.