Granted Patent
Utility
US 4,950,819 · App. 07/245,489
Process for the preparation of alkali metal salts of phosphonic acid monoalkyl esters
Inventors:
Claus D. Weis, Peter Werner Sutter
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Sep 19, 1988
Inventors
Claus D. Weis
Peter Werner Sutter
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.