Granted Patent
Utility
US 4,764,550 · App. 06/896,896
Tetrahalophthalate esters as flame retardants for polyphenylene ether resins
Inventors:
Ronald F. Lovenguth, Joseph M. Bohen
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Aug 15, 1986
Inventors
Ronald F. Lovenguth
Joseph M. Bohen
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.