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. 13, 1978
Filed:
Feb. 17, 1977
Applicant:
Inventor:
Norman G Looper, San Diego, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250205 ; 250575 ; 356206 ;
Abstract
In the control and measurement of opacity, turbidity, thickness and other factors affecting the transmission of light a ratiometric method and apparatus for measuring the transparency of a specimen by comparison to a reference specimen, wherein electronic technology is used for controlling the intensity of one light source in relation to another without using any mechanically moving parts. The invention can be applied to the regulation of any two voltage controlled energy sources used in the ratiometric measurement of physical or chemical parameters.