Granted Patent
Utility
US 5,135,740 · App. 07/418,776
Porous particles in preparations involving immiscible phases
Inventors:
Martin Katz, Chung-Heng Cheng
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: Oct 2, 1989
Inventors
Martin Katz
Chung-Heng Cheng
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.