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:
Feb. 21, 1995
Filed:
Aug. 15, 1990
Other;
Abstract
The keratometer comprises an illumination system made as the following components located before a cornea: a light source, an objective lens, ring-shaped measuring marks interposed between the light source and the objective lens on the focal surface of the illumination system symmetrically with respect to the optic axis of the objective lens, and a cone-shaped mirror. The cone-shaped mirror is interposed between the objective lens of the illumination system and the cornea and is shaped as a cone frustum having its inner surface provided with a reflecting coating. The keratometer comprises also a unit for recording the images of the measuring marks and a projection lens, the latter being composed of two elements one of which is in fact the objective lens of the illumination system and the other element is located on the optic axis of the illumination system objective lens between the latter and the unit for recording the images of the measuring marks.