Granted Patent
Utility
US 4,883,891 · App. 07/258,536
Phosphate and phosphonate compounds
Inventors:
Thomas A. Hardy, Edward N. Walsh
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Oct 17, 1988
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.