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:
Jun. 30, 1998
Filed:
May. 17, 1996
Applicant:
Inventor:
Vadim Laser, Cincinnati, OH (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
235462 ; 235468 ;
Abstract
An apparatus and method for reading invisible messages is disclosed. Two light sources impinge upon a surface upon which a luminescent message is located. The first light excites the luminescent message, which luminesces and emits a luminescent light. The luminescent light is received by an image sensor and is converted into a first electric signal. The second light has wavelengths substantially similar to the luminescent light, which reflects from the surface and is received by an image sensor and converted to a second electric signal. The first and second signals are processed to compensate for local variations in the reflectivity of the surface.