Granted Patent
Utility
US 4,973,727 · App. 07/300,463
Method for preparation of metal salts of methyl phosphonic acids
Inventors:
James Gainer, Donald Richard Randell
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Jan 23, 1989
Inventors
James Gainer
Donald Richard Randell
Assignee (at issue)
Ciba-Geigy
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.