Granted Patent
Utility
US 6,540,139 · App. 09/499,530
MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A VARIABLE SECOND DERIVATIVE SIGNAL PASS-BAND FILTER STRUCTURE HAVING FREQUENCY CHARACTERISTICS THAT ARE CONTROLLED IN A REAL-TIME MANNER BY DETECTING BAR CODE ELEMENTS IN ANALOG SCAN DATA SIGNALS PRODUCED BY SAID SYSTEM
Inventors:
Mark Lucera, Frank Check, C. Harry Knowles, Xiaoxun Zhu, LeRoy Dickson
Patented Case
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Granted: Apr 1, 2003
Filed: Feb 10, 2000
Inventors
Mark Lucera
Frank Check
C. Harry Knowles
Xiaoxun Zhu
LeRoy Dickson
Assignee (at issue)
METROLOGIC INSTRUMENTS, INC.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.