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:
Aug. 25, 1992
Filed:
May. 11, 1990
Daniel J Vaughan, Wilmington, DE (US);
Other;
Abstract
A solution, sol or colloidal dispersion of a substantially water insoluble metal hydroxide or acid and an alkali metal hydroxide are electrodialytically converted to a solid substantially water insoluble metal hydroxide or acid and a solution of the alkali metal hydroxide substantially free of the water insoluble metal hydroxide or acid. The conversion is effected by electrodialysis and electrotransport of an alkali metal cation from the solution, sol or dispersion through a cation permeable membrane into an aqueous alkali hydroxide solution and by using a water soluble anion of an acid to vary pH of the solution sol or dispersion to insolubilize the water insoluble metal hydroxide or acid. Sodium hydroxide etchants of aluminum are continously converted to solid aluminum hydroxide and aqueous sodium hydroxide free of aluminum hydroxide.