Granted Patent
Utility
US 4,920,184 · App. 07/228,867
Hydrophilic silicone rubber article and process for its preparation
Inventors:
Horst Schafer, Gerhard Kossmehl, Walter Neumann
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Aug 5, 1988
Inventors
Horst Schafer
Gerhard Kossmehl
Walter Neumann
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.