Granted Patent
Utility
US 4,898,733 · App. 06/794,530
Layered, compression molded device for the sustained release of a beneficial agent
Inventors:
Randolph B. DePrince, Ravi Viswanathan
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Nov 4, 1985
Inventors
Randolph B. DePrince
Ravi Viswanathan
Assignee (at issue)
International Minerals & Chemical Corp.
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.