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:
Apr. 26, 1988
Filed:
Oct. 02, 1985
Applicant:
Inventor:
Katsuhiko Kobayashi, Tokyo, JP;
Assignee:
Tokyo Kogaku Kikai Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61B / ; A61B / ;
U.S. Cl.
CPC ...
351206 ; 351211 ;
Abstract
A subjective ophthalmic instrument has optotypes which are observed by the patient through a correcting lens system of adjustable refractive power. The subjective ophthalmic instrument further has a optotype examination system which includes an imaging optical system for producing an image of a patient's fundus projected with an image of the optotypes at a camera tube, and display means for displaying the optotype image in accordance with the output of the camera tube.