Granted Patent
Utility
US 5,194,556 · App. 07/638,949
Rigid contact lenses with improved oxygen permeability
Inventors:
Karl F. Mueller, Bernhard Seiferling, Michael Bochnik
Patented Case
View Patent ↗
Granted: Mar 16, 1993
Filed: Jan 9, 1991
Inventors
Karl F. Mueller
Bernhard Seiferling
Michael Bochnik
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.