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. 21, 1995
Filed:
Jul. 12, 1994
Katsuhiko Tomita, Ohtsu, JP;
Horiba, Ltd., Kyoto, JP;
Abstract
A method of producing a pH-responsive membrane by coating a substrate with an anhydrous coating solution of tantalum alkoxide. In a first preferred embodiment, an anhydrous tantalum alkoxide solution is deposited drop by drop on a surface of an electrode substrate which is rapidly rotating to form a film of tantalum alkoxide. After drying to remove the solvent, the electrode is baked to decompose the tantalum alkoxide, thereby forming a pH-responsive membrane of tantalum pentoxide. The thickness of this membrane can be controlled by altering the speed of substrate rotation and the volume of coating solution deposited thereon. In a second preferred embodiment, an electrode substrate is immersed in an anhydrous coating solution of a tantalum alkoxide followed by pulling the electrode substrate from the solution at a controlled rate to form a tantalum alkoxide film which is then converted to a pH-responsive membrane of tantalum pentoxide by drying and baking.