Granted Patent
Utility
US 5,073,539 · App. 07/468,388
Transdermal administration of zwitterionic drugs
Inventors:
Gerard C. Mazzenga, Bret Berner
Patented Case
View Patent ↗
Granted: Dec 17, 1991
Filed: Jan 22, 1990
Inventors
Gerard C. Mazzenga
Bret Berner
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.