Granted Patent
Utility
US 4,873,306 · App. 07/215,202
Urethanes containing fluorine and polysiloxane, process for their preparation and their use
Inventors:
Frank Wehowsky, Martin Liebiger
Patented Case
View Patent ↗
Granted: Oct 10, 1989
Filed: Jul 5, 1988
Inventors
Frank Wehowsky
Martin Liebiger
Assignee (at issue)
Hoechst 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.