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:
Dec. 11, 2001
Filed:
Jan. 28, 2000
Wilfried Hofmann, München, DE;
Tschangiz Scheybani, München, DE;
Abstract
A method for producing a filter includes the steps of providing a blank of etchable semiconductor material having a first side and a second side and affixing a holding element to the blank. The holding element is chemically resistant to an etching solution. A current source is connected to the blank and at least one of the first and second sides of the blank is illuminated with light. The holding element and the blank are immersed in the etching solution until the first side of the blank is wetted so that the first side is etched electrochemically. The holding element is affixed to the blank such that contact areas between the holding element and the blank remain free of the etching solution.