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. 04, 2000
Filed:
Apr. 06, 1998
Applicant:
Inventors:
Peter Winston Sites, Knoxville, TN (US);
Anthony Scott Nelms, Maryville, TN (US);
Assignee:
Northrop Grumman Corporation, Los Angeles, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
3562391 ; 356430 ;
Abstract
Inspection apparatus for determining defects in a planar light transmissive object. A diffuse light is projected through a mask toward an object under test at an inspection location. A digital video camera observes the inspection location and obtains images of the object. These images are examined and processed by a signal processor to obtain indications of various defects. The mask utilized is of a selected design having either multiple alternating narrow clear and opaque stripes, or a single narrow clear stripe straddled by opaque regions or a single narrow opaque stripe straddled by clear regions.