Granted Patent
Utility
US 4,831,097 · App. 07/169,716
Heterocyclic containing cellulosic graft polymers
Inventors:
Jui-Chang Chuang, Ian W. Cottrell, Stephen C. Johnson
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Mar 21, 1988
Inventors
Jui-Chang Chuang
Ian W. Cottrell
Stephen C. Johnson
Assignee (at issue)
GAF 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.