Granted Patent
Utility
US 4,330,487 · App. 06/201,866
N,N-Dimethylene phosponic acids of alkylene diamines
Inventors:
Derek Redmore, William S. Paley
Patented Case
View Patent ↗
Granted: May 18, 1982
Filed: Oct 29, 1980
Inventors
Derek Redmore
William S. Paley
Assignee (at issue)
Petrolite 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.