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. 13, 2016
Filed:
Dec. 19, 2007
Daniel H. Carlson, St. Paul, MN (US);
John T. Strand, St. Paul, MN (US);
Daniel S. Wertz, St. Paul, MN (US);
Levent Biyikli, St. Paul, MN (US);
Brian K. Nelson, St. Paul, MN (US);
Daniel H. Carlson, St. Paul, MN (US);
John T. Strand, St. Paul, MN (US);
Daniel S. Wertz, St. Paul, MN (US);
Levent Biyikli, St. Paul, MN (US);
Brian K. Nelson, St. Paul, MN (US);
3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US);
Abstract
Methods and systems for determining longitudinal position of an elongated web are described. Sensors are used to detect one or more substantially continuous fiducial marks disposed longitudinally on the web. The sensors generate signals associated with the fiducial marks. A position detector receives the signals and determines a longitudinal position of the web using the sensor signals. The fiducial marks may be periodic fiducial marks, such as sine and/or cosine marks on the web and/or may be piecewise continuous marks. The coarse longitudinal position of the web can be determined based on periodically recurring features of the fiducial marks. The fine longitudinal position can be determined based on continuous portions of the fiducial marks between the periodically recurring features.