Granted Patent
Utility
US 6,358,557 · App. 09/394,577
Graft polymerization of substrate surfaces
Inventors:
Guo Wang, Xianping Zhang
Patented Case
View Patent ↗
Granted: Mar 19, 2002
Filed: Sep 10, 1999
Inventors
Guo Wang
Xianping Zhang
Assignee (at issue)
STS Biopolymers, 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.