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:
Jul. 25, 1989
Filed:
Apr. 15, 1987
Applicant:
Inventor:
Robert N West, Chislehurst, GB;
Assignee:
Sira Limited, Kent, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
250572 ; 356237 ; 356430 ; 250216 ;
Abstract
Apparatus for detecting discontinuities in a radiation diffusing surface (10) such as paper. Radiation is passed to the surface and a radiation collector (19) receives the diffused radiation (18) from a limited area of the surface (10). The radiation collector receives the diffuse radiation from a limited area only and from within predetermined angular limits other than normal to the surface. The radiation collector (19) defines said predetermined angular limits through total internal reflection.