Granted Patent
Utility
US 5,607,698 · App. 08/339,447
Method of preserving ophthalmic solution and compositions therefor
Inventors:
Stephen M. Martin, Fu-Pao Tsao
Patented Case
View Patent ↗
Granted: Mar 4, 1997
Filed: Nov 14, 1994
Inventors
Stephen M. Martin
Fu-Pao Tsao
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.