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:
Jan. 18, 1977
Filed:
May. 21, 1975
Abstract
A photometer for measuring the light permeability of a material for testing is made portable for hand-held operation outside a laboratory for measurements such as determining the proportion of hemoglobin in human blood. It includes a battery power supply that energizes a lamp, an opening for receiving a cuvet for a measurement, and a measuring circuit having a light-sensitive element. An indicator instrument in the measuring circuit indicates zero compensation, and a manually movable wedge filter is in the path of the light beam for adjusting the light passing through the cuvet. A manually operable element effects a zero compensation of the measuring circuit before a test is made, and a viewable scale on a setting member carrying the wedge filter directly displays a test result value from adjustment of the wedge filter during measurement of the material.