Granted Patent
Utility
US 4,638,446 · App. 06/499,596
Apparatus and method for reducing topographical effects in an auger image
Inventor:
Paul W. Palmberg
Patented Case
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Granted: Jan 20, 1987
Filed: May 31, 1983
Inventor
Paul W. Palmberg
Assignee (at issue)
PerkinElmer, 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.