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. 16, 1998
Filed:
May. 28, 1997
Applicant:
Inventor:
Hiroshi Obuse, Tokyo, JP;
Assignee:
Kurita Water Industries Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B08B / ; C23G / ; C23G / ; C23G / ;
U.S. Cl.
CPC ...
510175 ; 510176 ; 510177 ; 510178 ; 510407 ; 510409 ; 510436 ; 510467 ; 510493 ; 510500 ;
Abstract
A cleaning process which comprises contacting a printed circuit board to which a residue of a flux is attached with a cleaning composition containing a first solvent and an organic compound, and then with a second solvent. The first solvent is an aliphatic hydrocarbon solvent having 5 to 20 carbon atoms. The organic compound is a 1-alkyl-2-pyrrolidone having 3 to 18 carbon atoms, a tri-alkylphosphine oxide having 3 to 8 carbon atoms or a di-alkylsulfoxide having 3 to 8 carbon atoms. The organic compound is in an amount of 10 to 300 g per liter of the hydrocarbon solvent. The cleaning composition does not contain a halogen compound.