Granted Patent
Utility
US 4,332,736 · App. 06/190,009
Production of 1-hydroxyalkylidene-1, 1-diphosphonic acid esters
Inventors:
William E. Starner, Walter F. Yext
Patented Case
View Patent ↗
Granted: Jun 1, 1982
Filed: Sep 22, 1980
Inventors
William E. Starner
Walter F. Yext
Assignee (at issue)
Air Products and Chemicals, 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.