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:
Jun. 04, 1991
Filed:
Jan. 16, 1990
Gerhard Brunner, Augsburg, DE;
Erhardt & Leimer GmbH, Augsburg, DE;
Abstract
A process and device for determining the location of at least one edge of a moving web within a measurement zone and in which a linear array of liquid crystal light modulators is interposed between a light source and a light receiver extending transversely to the edge along a scanning zone while a controller successively activates the light modulators to scan a transparent surface zone along the measurement zone. The point at which light is last received (because of obstruction by the edge) or the first received in a pass (because of lack of obstruction by the edge) at the receiver from the source through the scanning transparent zone is used as the measure of the location of the edge.