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:
Mar. 26, 1996
Filed:
Oct. 03, 1994
Takeshi Dohku, Osaka, JP;
Kazuo Yoshida, Higashi-Osaka, JP;
Kazunori Koba, Kawachinagano, JP;
Kazuyuki Miyake, Ibaraki, JP;
Hitachi Zosen Corporation, Osaka, JP;
Abstract
The invention provides a cleaning method comprising: a step of immersing the object of cleaning first in a first tank to wash roughly by bubbling from beneath, and showering with purified water from above when lifting the object, a step of immersing the object coming from the first tank in a second tank to wash preliminarily with ultrasonic waves, and showering with purified water from above when lifting the object, a step of immersing the object coming from the first tank or second tank successively in a third tank to wash thoroughly with ultrasonic waves and water jet, and showering with purified water from above when lifting the object, and a step of immersing the object coming from the third tank finally into a fourth tank to finish with water jet, and lifting. In this cleaning method, only purified water harmless to human and environment is used as cleaning fluid, and the same cleanliness as in conventional cleaning with chlorofluorocarbons or trichloroethane is obtained, while there is no side effect such as discoloring of work surface.