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:
May. 03, 2016
Filed:
Jan. 05, 2006
Applicants:
Calum H. Munro, Wexford, PA (US);
Mark D. Merritt, State College, PA (US);
Sean Purdy, Allison Park, PA (US);
Inventors:
Calum H. Munro, Wexford, PA (US);
Mark D. Merritt, State College, PA (US);
Sean Purdy, Allison Park, PA (US);
Assignee:
PPG Industries Ohio, Inc., Cleveland, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B42D 15/00 (2006.01); B42D 15/10 (2006.01); B41M 3/10 (2006.01); B42D 25/29 (2014.01); B44F 1/10 (2006.01); B41M 3/14 (2006.01);
U.S. Cl.
CPC ...
B41M 3/10 (2013.01); B41M 3/148 (2013.01); B42D 25/29 (2014.10); B44F 1/10 (2013.01); B42D 2035/20 (2013.01);
Abstract
A method of marking an article with a watermark that diffracts radiation according to Bragg's law is disclosed. The watermark includes a periodic array of particles fixed in a matrix. The watermark may change colors with viewing angle, disappear and reappear with viewing angle or may diffract non-visible radiation that is detectable at certain angles of detection.