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:
Oct. 19, 1982
Filed:
Apr. 22, 1980
Applicant:
Inventors:
Jacques Lewiner, 92210 Saint-Cloud, FR;
Gerard Dreyfus, 91120 Palaiseau, FR;
Didier Perino, 92150 Suresnes, FR;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01T / ;
U.S. Cl.
CPC ...
250376 ; 250388 ;
Abstract
The invention relates to a device for measuring irradiation capable of modifying the charge of an electret. It is arranged in a portable cassette, between two electrodes held separated by a part and connected to a measuring circuit. A conductive shutter is movable parallel to itself and to the electret between this electret and than electrode, so as to alternately mask this electret with respect to this electrode and to render the electret visible to the electrode. The measurement exploits differences in charge of the electret read according to the movements of the shutter.