Granted Patent
Utility
US 5,008,112 · App. 06/809,437
Device for the extended delivery of diffusible agents
Inventors:
Randolph B. DePrince, Ravi Viswanathan
Patented Case
View Patent ↗
Granted: Apr 16, 1991
Filed: Dec 16, 1985
Inventors
Randolph B. DePrince
Ravi Viswanathan
Assignee (at issue)
International Minerals & Chem. 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.