Granted Patent
Utility
US 4,395,496 · App. 06/321,506
Cured cellulose ester, method of curing same, and use thereof
Inventors:
Joseph Wittmann, John M. Evans
Patented Case
View Patent ↗
Granted: Jul 26, 1983
Filed: Nov 16, 1981
Inventors
Joseph Wittmann
John M. Evans
Assignee (at issue)
UCO Optics, 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.