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:
Nov. 12, 2024
Filed:
Nov. 16, 2021
Sumitomo Electric Industries, Ltd., Osaka, JP;
Sumitomo Electric Printed Circuits, Inc., Shiga, JP;
Mec Company Ltd., Hyogo, JP;
Shoichiro Sakai, Osaka, JP;
Ryuta Ohsuka, Osaka, JP;
Koji Nitta, Osaka, JP;
Yoshihito Yamaguchi, Shiga, JP;
Masaharu Yasuda, Osaka, JP;
Akira Tsuchiko, Osaka, JP;
Koji Kasuya, Osaka, JP;
Kenji Nishie, Hyogo, JP;
Yu Fukui, Hyogo, JP;
SUMITOMO ELECTRIC INDUSTRIES. LTD., Osaka, JP;
SUMITOMO ELECTRIC: PRINTED CIRCUITS, INC., Shiga, JP;
MEC COMPANY LTD., Hyogo, JP;
Abstract
In manufacturing a printed circuit board using a semi-additive method, a removal liquid that has been used in removing a nickel-chromium-containing layer () is regenerated by contacting the removal liquid with a chelate resin having a functional group represented by a following formula (1): where a plurality of Rs are identical divalent hydrocarbon groups having 1 to 5 carbons, and a portion of hydrogen atoms may be substituted with halogen atoms.