Granted Patent
Utility
US 4,808,744 · App. 07/020,829
Phosphonate containing phosphonates
Inventors:
Thomas A. Hardy, Edward N. Walsh
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Mar 2, 1987
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.