Granted Patent
Utility
US 4,839,177 · App. 06/939,810
System for the controlled-rate release of active substances
Inventors:
Paolo Colombo, Aldo La Manna, Ubaldo Conte
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Dec 9, 1986
Inventors
Paolo Colombo
Aldo La Manna
Ubaldo Conte
Assignee (at issue)
JAGOTEC AG
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.