Granted Patent
Utility
US 4,886,895 · App. 07/306,113
Phosphate-containing and phosphonate-containing phosphate esters
Inventors:
Thomas A. Hardy, Edward N. Walsh
Patented Case
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Granted: Dec 12, 1989
Filed: Feb 6, 1989
Inventors
Thomas A. Hardy
Edward N. Walsh
Assignee (at issue)
Akzo America 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.