Granted Patent
Utility
US 5,252,337 · App. 07/720,978
Controlled release calcium channel blocker microcapsules
Inventor:
Thomas C. Powell
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Jun 25, 1991
Inventor
Thomas C. Powell
Assignee (at issue)
EURAND AMERICA, INC.
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.