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:
Mar. 09, 1999
Filed:
Oct. 24, 1996
Applicant:
Inventor:
Stephen Phillips, Walnut Creek, CA (US);
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385127 ; 385901 ;
Abstract
A security device in the form of optically variable waveguides that produce color shifts at particular exit viewing angles. Wavelength filtering in the cladding layers using interference coatings and colorants produces waveguide modes of different colors. These optical devices can be incorporated within currency paper, gaming chips or credit cards to help determine their genuineness.