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. 05, 1991
Filed:
Aug. 27, 1990
Patrice Deroux-Dauphin, Saint Egreve, FR;
Compagnie Europeenne de Composants Electroniques LCC, Courbevoie, FR;
Abstract
A method of manufacturing the pole pieces and the gap of magnetic heads in thin layers for computer, audio and video applications, starting from a silicon substrate, includes formation of an insulator layer on a silicon substrate followed by deposition of a metal layer on the insulator layer and of a masking resin layer on the metal layer. The substrate covered with the insulator layer and the metal layer is etched to form wells bordering a bar of a determined width and the left-over portion of the metal layer etched is removed. The etched substrate is thermally oxidized to develop a silicon oxide layer enabling the bar to be adjusted to obtain the desired gap. A conductive layer is deposited at the bottom of the wells followed by the electrolytic deposition of a magnetic material in the wells and the removal of the left-over portion of the insulator layer initially deposited on the substrate.