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. 12, 1979
Filed:
Oct. 22, 1976
Kenji Imura, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
An eye fundus plethysmograph assembly is provided for determining variations in the amount of blood present at the fundus of the eye. A source of at least a first and second wavelength of light energy is specifically directed into a subject eye for reflection from the retina or fundus of the eye. The reflected light is directed at a receiving element that can produce a first output signal representative of a reflected first wavelength and a second output signal representative of a reflected second wavelength. A processing circuit is provided for subtracting one of the first and second output signals from the other to provide a representative measurement output of the amount of blood in the blood vessels adjacent the eye fundus. The output signals can be recorded or displayed in any desired form to facilitate the interpretation of the amount of blood present.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile