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:
Aug. 08, 1995
Filed:
Feb. 09, 1994
Craig E Maddox, Lilburn, GA (US);
AT&T Global Information Solutions Company, Dayton, OH (US);
Abstract
A system and method for testing bar code scanner window viability which determines whether the window is scratched or otherwise damaged enough to require replacement. The system includes a laser beam source. The laser beam passes through a window glass for scanning a bar code label. Light reflected from the bar code label passes through the window glass and is detected and converted into an electrical signal. Finally, a processor determines the bar code information from the electrical signal and determines whether the window glass is damaged enough that the bar code information cannot accurately be determined. The method determines the variance between the widths of the bars and spaces from a plurality of bar code scans and compares the variance to a predetermined threshold. The window glass is replaced when the threshold is exceeded.