Granted Patent
Utility
US 4,276,273 · App. 06/176,657
Production of sodium polyphosphates
Inventor:
James D. McGilvery
Patented Case
View Patent ↗
Granted: Jun 30, 1981
Filed: Aug 11, 1980
Inventor
James D. McGilvery
Assignee (at issue)
ERCO Industries Limited
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.