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:
Jan. 30, 1990
Filed:
May. 06, 1988
Applicant:
Inventor:
Peter Ekelund, Tunbridge Wells, GB;
Assignee:
Svecia Antiqua S.A., Fribourg, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B42D / ; B42F / ; G02B / ;
U.S. Cl.
CPC ...
283 90 ; 283 70 ; 350407 ;
Abstract
A document security article is disclosed in which a light polarizing element is contained within a flexible sheet element. A region of the light polarizing element is exposed at a window at both faces of the sheet element and optionally at a further window at one face of the sheet element. Folding the article to align the windows produces cross polarization between the exposed regions of the light polarizing element.