Granted Patent
Utility
US 6,632,442 · App. 09/632,715
Intumescent polymer compositions
Inventors:
Leonard J. Chyall, Harry A. Hodgen, Frederick J. Vyverberg, Robert W. Chapman, Phillip Kim Chou
Patented Case
View Patent ↗
Granted: Oct 14, 2003
Filed: Aug 4, 2000
Inventors
Leonard J. Chyall
Harry A. Hodgen
Frederick J. Vyverberg
Robert W. Chapman
Phillip Kim Chou
Assignee (at issue)
PABU Services, 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.