Granted Patent
Utility
US 5,817,857 · App. 08/880,095
(4-Hydroxy-alkylphenyl diphenyl phosphate flame rerardants
Inventors:
Danielle A. Bright, Ronald L. Pirrelli
Patented Case
View Patent ↗
Granted: Oct 6, 1998
Filed: Jun 20, 1997
Inventors
Danielle A. Bright
Ronald L. Pirrelli
Assignee (at issue)
AKZO NOBEL N.V.
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.