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:
Mar. 29, 1977
Filed:
Jan. 21, 1976
Brian L Dalton, London, EN;
Crosfield Electronics Limited, London, EN;
Abstract
In apparatus for excavating material from a gravure cylinder surface, for example, by means of a laser beam, the polarization of the laser beam is modulated and the modulated beam is then passed through a polarization analyzer system to a focusing lens which focuses light on to the surface to be excavated. The polarization analyzing system includes an aperture through which a central portion of the laser beam passes, regardless of its polarization the extent to which the remainder of the beam is transmitted by the analyzer depending upon its polarization modulation. The effect of the aperture is to reduce variation in excavation width with the intensity of the beam.