Granted Patent
Utility
US 4,338,246 · App. 06/295,163
Intumescent flame retardant thermoplastic polymethacrylate compositions
Inventor:
Yuval Halpern
Patented Case
View Patent ↗
Granted: Jul 6, 1982
Filed: Aug 21, 1981
Inventor
Yuval Halpern
Assignee (at issue)
Borg-Warner Chemicals, 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.