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. 26, 1993
Filed:
Nov. 27, 1991
Kenichi Suzuki, Nagoya, JP;
Masaki Kajino, Nagoya, JP;
Kazuyoshi Ogawa, Kasugai, JP;
Takashi Asano, Ama, JP;
Mineo Ogino, Aichi, JP;
Hideo Aihara, Toyota, JP;
Fumio Shimizu, Aichi, JP;
Masazumu Onishi, Toyota, JP;
Yasuyuki Suzuki, Toyota, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A brightening chemical polishing solution for a hardened steel article (e.g., a carburized and quenched gear) comprises hydrofluoric acid having a molar concentration of from 0.2 to 2 mol/l, hydrogen peroxide having a molar concentration of from 0.4 to 4 mol/l, and water, a molar ratio of the hydrofluoric acid to the hydrogen peroxide being from 1:1.5 to 1:2.8. The steel article is quench hardened and is chemically polished in the solution. A shot-peening is additionally performed, prior to the polishing.