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. 16, 2002
Filed:
Nov. 12, 1998
Gerhard Mueller, Berlin, DE;
Thomas Fricke, Berlin, DE;
Laser-und Medizin-Technologie gGmbH, Berlin, DE;
Abstract
A process to remove a surface layer from a substrate by irradiating laser radiation, wherein the surface is scanned sequentially with the laser radiation being concentrated to a focus, before irradiating a predetermined surface element a thin fluid film or a fluid droplet cover is applied which covers at least that surface element, and the laser beam influences the surface element only for a very short treatment interval, especially less then 10 ms. By appropriate choice of the process parameters power density, treatment interval length, thickness of the fluid film, surface adhesion of the fluid, absorption characteristics of the fluid for the effective laser wavelength, and absorption characteristics of the fluid vapor an explosive evaporation of the fluid film is effected which results in a flaking of the surface and an evaporation of loose residues of the surface layer.