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. 08, 2008
Filed:
May. 12, 2004
Kengo Kobayashi, Ama-gun, JP;
Osamu Kasebe, Okazaki, JP;
Hiroyoshi Sugawara, Anjo, JP;
Kazuhisa Uchiyama, Nagoya, JP;
Kenji Karube, Atsugi, JP;
Kazunari Hamamura, Tsukui-gun, JP;
Kensuke Shimoda, Ebina, JP;
Kengo Kobayashi, Ama-gun, JP;
Osamu Kasebe, Okazaki, JP;
Hiroyoshi Sugawara, Anjo, JP;
Kazuhisa Uchiyama, Nagoya, JP;
Kenji Karube, Atsugi, JP;
Kazunari Hamamura, Tsukui-gun, JP;
Kensuke Shimoda, Ebina, JP;
Denso Corporation, Kariya, JP;
Abstract
A method of surface treating an aluminum alloy base body of an heat exchanger which method enables an etching procedure to be carried out uniformly and quickly and a corrosion-resistant chemical conversion coating to be formed, is effected by pretreating the Al heat exchanger base body with an aqueous pre-treating liquid having a pH of 9.0 or less, etching the pretreated base body with an aqueous alkaline solution having a pH of 9.0 or more, and then subjecting the etched base body to a chemical conversion treatment or a hydrophilicity-enhancing treatment.