Granted Patent
Utility
US 4,278,538 · App. 06/028,773
Methods and apparatus for sorting workpieces according to their color signature
Inventors:
Hopeton S. Lawrence, John D. Michalski
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Apr 10, 1979
Inventors
Hopeton S. Lawrence
John D. Michalski
Assignee (at issue)
Western Electric Company, 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.