Granted Patent
Utility
US 5,871,722 · App. 08/419,887
Ionic beads useful 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: Feb 16, 1999
Filed: Apr 11, 1995
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.