Granted Patent
Utility
US 4,851,173 · App. 06/878,971
Oriented polymer films, a process for the preparation thereof
Inventors:
Malcolm Robert Mackley, Gary S. Sapsford
Patented Case
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Granted: Jul 25, 1989
Filed: May 20, 1986
Inventors
Malcolm Robert Mackley
Gary S. Sapsford
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT CORPORATION
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.