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. 13, 1989
Filed:
Feb. 17, 1988
Kazuo Nunokawa, Tokyo, JP;
Tokyo Kogaku Kikai Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical system for a retinal camera comprises objective lens adapted to be located toward a patient's eye. The retina of the patient's eye is illuminated and photographed through the objective lens, which has a first biconvex type lens means and a second biconvex type lens means with a space between them, the first biconvex type lens means has a curvature radius of the first convex surface open to the air and faces toward the eye of which is larger than that of the other second convex surfaces open to the air, and the second biconvex type lens means of which curvature radius of third convex surface open to the air and facing toward the first biconvex type lens means is larger than that of the other fourth convex surfaces open to the air.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile