Granted Patent
Utility
US 4,925,861 · App. 07/181,156
Carboxystyrene derivatives and drugs containing them as effective ingredients
Inventor:
Yoshio Hayashi
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Apr 13, 1988
Inventor
Yoshio Hayashi
Assignee (at issue)
Mitsubishi Kasei 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.