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:
Jan. 05, 2021
Filed:
Feb. 25, 2020
Applicant:
Macdermid Acumen, Inc., Waterbury, CT (US);
Inventor:
Roderick D. Herdman, Kingsbury, GB;
Assignee:
MacDermid Acumen, Inc., Waterbury, CT (US);
Primary Examiner:
Int. Cl.
CPC ...
C25B 1/21 (2006.01); C01G 45/02 (2006.01); C09K 13/04 (2006.01); H05K 3/38 (2006.01);
U.S. Cl.
CPC ...
C01G 45/02 (2013.01); C09K 13/04 (2013.01); C25B 1/21 (2013.01); H05K 3/381 (2013.01);
Abstract
A method of regenerating an etch solution comprising a metastable complex of manganese(III) ions in a strong acid is described in which at least a portion of the manganese(III) ions in the metastable complex have been destabilized, causing them to disproportionate into manganese dioxide and manganese(II) ions. The method includes the steps of i) adding an effective amount of a reducing agent to the solution; ii) allowing the reducing agent to react with the solution to cause manganese dioxide to dissolve; and (iii) applying an electrical current to regenerate manganese(III) ions in the solution.