Granted Patent
Utility
US 4,285,073 · App. 06/120,345
Keratoprosthetic polyurethane
Inventor:
Michael Szycher
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Feb 11, 1980
Inventor
Michael Szycher
Assignee (at issue)
Thermo Electron GmbH
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.