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:
Oct. 30, 2007
Filed:
Sep. 10, 2004
Applicants:
Michael S. Groess, Oakdale, MN (US);
Stephan J. Pankratz, Sofia, BG;
Inventors:
Michael S. Groess, Oakdale, MN (US);
Stephan J. Pankratz, Sofia, BG;
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N 21/88 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method includes providing a polymerized optical film structure having a microstructured surface, forming a scratch having a length on the microstructured surface to form a scratched optical film, illuminating the scratched optical film to form an illuminated scratch, measuring a plurality of scratch contrast ratio values along the length of the illuminated scratch with a detector, and determining a maximum scratch contrast ratio from the plurality of scratch contrast ratio values along the length of the scratch.