Granted Patent
Utility
US 4,988,675 · App. 07/301,680
Method for preventing secondary effects
Inventors:
Ernst R. Froesch, Hans-Peter Guler, Christoph Schmid, Jurgen Zapf
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Jan 25, 1989
Inventors
Ernst R. Froesch
Hans-Peter Guler
Christoph Schmid
Jurgen Zapf
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.