OPTICAL MARK READING COMPUTER SYSTEM

Brand Owner Address Description
SENTRY SCANTRON CORPORATION 1313 Lone Oak Road Eagan MN 55121 OPTICAL MARK READING COMPUTER SYSTEM, COMPRISING AN OPTICAL SCANNER, DOCUMENT TRANSPORTERS, DISPLAY AND CONTROL TERMINALS, A COMPUTER PROCESSOR UNIT, COMPUTER MEMORY UNITS, COMPUTER PROGRAMS AND PRINTERS SOLD IN VARIOUS COMBINATIONS AS A UNIT, AND REPLACEMENT PARTS AND STRUCTURAL COMPONENTS THEREFOR FOR SUCH USES AS GRADE REPORTING, SCORING ANSWER SHEETS, COURSE SELECTION, SURVEYS ORDER ENTRY AND ATTENDANCE REPORTING;
 

Where the owner name is not linked, that owner no longer owns the brand

   
Technical Examples
  1. An aberration mark for use in an optical photolithography system, and a method for estimating overlay errors and optical aberrations. The aberration mark includes an inner polygon pattern and an outer polygon pattern, wherein each of the inner and outer polygon patterns include a center, and two sets of lines and spaces having a different feature size and pitch that surround the outer polygon pattern. The aberration mark can be used to estimate overlay errors and optical aberrations. In some embodiments, the mark can also be used with scatterometry or scanning electron microscope devices. In other embodiments, the mark can be used to monitor aberrations of a lens in an optical photolithography system.