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. 20, 1981
Filed:
Jun. 27, 1979
Applicant:
Inventors:
William J Benton, Pittsburgh, PA (US);
Joseph R Quigley, Pittsburgh, PA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428-1 ; 4284231 ; 4284237 ; 428913 ;
Abstract
A multi-band liquid crystal film for visual observation of two or more patterns is prepared by laminating at least two polyurethane films, each containing discrete aggregates of liquid crystals against a black film such that the visual response of the liquid crystals of each succeeding polyurethane film is different than that of the liquid crystals in the other film or films.