Granted Patent
Utility
US 4,975,428 · App. 07/200,809
Treatment of glaucoma using phosphodiesterase inhibitors
Inventor:
John W. Shell
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: May 31, 1988
Inventor
John W. Shell
Assignee (at issue)
Iolab Corporation
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.