Granted Patent
Utility
US 4,581,396 · App. 04/760,664
Flame retardants and compositions containing them
Inventor:
Joseph Sonnenberg
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Sep 18, 1968
Inventor
Joseph Sonnenberg
Assignee (at issue)
Raychem Limited
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.