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. 23, 2008
Filed:
Apr. 24, 2003
Lennart Olsson, Malmö, SE;
Lennart Olsson, Malmö, SE;
Obducat AB, Malmo, SE;
Abstract
A method and device for forming an optical or magnetic memory medium or a template for making such memory media, including suspending an essentially flat substrate rotatably about an axis, arranging a particle beam source to expose the surface layer to a particle beam, rotating the substrate such that the particle beam forms a groove in the surface layer by exposure to a predetermined degree, which groove has a width on the order of 1-100 nm, and controlling the position of the particle beam and the axis relative to each other, during rotation of the substrate about the axis so that part of the groove is subjected to more than one exposure to the particle beam, whereby the groove is formed as a sum of said more than one exposure, which sum corresponds to said predetermined degree of exposure.