Granted Patent
Utility
US 4,521,391 · App. 06/570,477
Method to improve yields of sodium hypophosphite
Inventor:
William E. Estes
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Jan 13, 1984
Inventor
William E. Estes
Assignee (at issue)
Stauffer Chemical Company
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.