Granted Patent
Utility
US 6,632,868 · App. 09/841,988
Intercalates formed with polypropylene/maleic anhydride-modified polypropylene intercalants
Inventors:
Guoqiang Qian, Jae Whan Cho, Tie Lan
Patented Case
View Patent ↗
Granted: Oct 14, 2003
Filed: Apr 25, 2001
Inventors
Guoqiang Qian
Jae Whan Cho
Tie Lan
Assignee (at issue)
AMCOL INTERNATIONAL 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.