Granted Patent
Utility
US 4,938,894 · App. 07/115,688
Tetrahalophthalate esters as flame retardants for ABS (acrylonitrile-butadiene styrene terpolymer) resins
Inventors:
Joseph M. Bohen, Ronald F. Lovenguth
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: Oct 30, 1987
Inventors
Joseph M. Bohen
Ronald F. Lovenguth
Assignee (at issue)
Pennwalt 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.