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. 29, 1994
Filed:
Oct. 13, 1992
Applicant:
Inventor:
Matthew L Severns, McLean, VA (US);
Assignee:
LKC Technologies, Inc., Gaithersburg, MD (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61B / ;
U.S. Cl.
CPC ...
128745 ; 351242 ; 351243 ;
Abstract
An opaque plate is positioned in front of a patient undergoing color vision testing. A number of openings are formed in the plate. Behind each disk is a hollow sphere having colored light sources mounted therein. By selectively energizing the colored light sources in a sphere, a mixture of light is presented at the corresponding transparent disk at a selected intensity. A tester can select one or more spheres to be internally illuminated by color light sources so that the patient is presented with a pattern of selectable color mixtures which checks his color vision.