Granted Patent
Utility
US 5,840,293 · App. 08/245,307
Ionic beads for controlled release and adsorption
Inventors:
Sergio Nacht, Richard Won, Martin Katz, Tai C. Cheng, Christine Liau, Robert Eury, Michael Froix
Patented Case
View Patent ↗
Granted: Nov 24, 1998
Filed: May 17, 1994
Inventors
Sergio Nacht
Richard Won
Martin Katz
Tai C. Cheng
Christine Liau
Robert Eury
Michael Froix
Assignee (at issue)
Advanced Poymer Systems, 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.