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:
Aug. 24, 2010
Filed:
Sep. 29, 2005
Applicants:
Harald Walter, Kilchberg, CH;
Marc Schnieper, Onex-Genéve, CH;
Alexander Stuck, Wettingen, CH;
Inventors:
Assignee:
CSEM Centre Suisse d'Electronique et de Microtechnique S.A., Neuchatel, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03H 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A security device comprises first zero order diffractive microstructure () on a substrate, a second zero order diffractive microstructure (), and an intermediate light transmissive layer () separating the two diffractive microstructures. The spacing (s) between the first () and second () diffractive microstructures is small enough so that optical interferences are produced between the diffractive microstructures. A further light transmissive layer () covers the second diffractive microstructure ().