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. 17, 1990
Filed:
Aug. 01, 1989
Applicant:
Inventor:
Isao Matsumura, Yokosuka, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61B / ;
U.S. Cl.
CPC ...
354212 ; 351247 ;
Abstract
A cornea shape measuring apparatus which is provided with first and second substantially ring-like index marks disposed at different positions in the direction of the optic axis and projected onto the cornea of an eye to be examined and in which the corneal reflection images of the first and second index marks are detected by a first position detector and the shape of the cornea is measured without depending on the working distance.