Granted Patent
Utility
US 5,871,551 · App. 08/758,242
Process for the preparation of anhydrous sodium sulfate
Inventor:
Edgar Rodriguez-Leon
Patented Case
View Patent ↗
Granted: Feb 16, 1999
Filed: Nov 27, 1996
Inventor
Edgar Rodriguez-Leon
Assignee (at issue)
Industria Del Alcali, S.A.DE C.V.
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.