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:
Jul. 02, 1991
Filed:
May. 01, 1989
Fred Johannsen, Varel, DE;
AEG Olympia Aktiengesellschaft, Wilhelmshaven, DE;
Abstract
A method for making an etched base plate for an ink printer head includes the steps of disposing on each face of a base plate a mask having a pattern, exposing the base plate simultaneously through the masks to light of a wavelength to which the base plate is photosenstive, heating the base plate to a temperature at which the amorphous glass structure in the exposed regions is converted to a ceramic crystalline structure and dipping the base plate into an etching agent solution to remove the crystalline structure from the base plate to thus provide in each plate face ink printing chambers, ink channels and at least one row of nozzle discharge openings in the shape of the exposed regions. The patterns formed on the masks are mirror images of each other.