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:
Sep. 07, 1993
Filed:
Jun. 05, 1992
Applicant:
Inventors:
Michael Stuke, Gottingen, DE;
Horst-Christian Langowski, Wolfratshausen, DE;
Tobias Damm, Leverkusen, DE;
Stefan Preuss, Gottingen, DE;
Assignee:
Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V., Goettingen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369100 ; 369116 ; 369112 ; 369118 ; 430321 ; 430323 ;
Abstract
In a method for recording information in an optical data memory by surface exturing, a substrate surface is first pre-treated or sensitized by selective irradiation at relatively low fluence. For selectivity of irradiation, a mask, a holographic imaging process, or direct writing may be used. In a second step, the sensitized regions are ablated from the surface by means of spatially non-selective irradiation at a different wavelength and at relatively high fluence.