Granted Patent
Utility
US 5,112,930 · App. 07/667,721
Modified polyurethanes containing perfluoroaliphatic groups and use thereof
Inventors:
Simpert Ludemann, Michael Bernheim, Bernhard Sandner, Erich Rossler, Hans-Burkhardt Vogel
Patented Case
View Patent ↗
Granted: May 12, 1992
Filed: Mar 11, 1991
Inventors
Simpert Ludemann
Michael Bernheim
Bernhard Sandner
Erich Rossler
Hans-Burkhardt Vogel
Assignee (at issue)
Ciba-Geigy
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.