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. 05, 1990
Filed:
May. 20, 1988
Applicant:
Inventors:
Jacques Sabater, Gif sur Yvette, FR;
Gerard Gillet, Biviers, FR;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
250571 ; 356429 ; 356432 ;
Abstract
A device for calibrating an apparatus for measuring the formation index of a sheet of paper in which an emitted light beam is directed through the sheet of paper and detected and electronically processed into a modulated output signal. The device has a frosted glass for diffusing the measuring beam of light and an opaque rod mounted for rotation in and out of the beam of light so as to provide a modulation of the detected light of a known amount which can then be used to calibrate the measuring apparatus by adjusting the various parameters of the apparatus to yield the desired known output modulation.