Granted Patent
Utility
US 4,880,574 · App. 06/934,058
Method for refining glyceride oils using partially dried amorphous silica hydrogels
Inventor:
William A. Welsh
Patented Case
View Patent ↗
Granted: Nov 14, 1989
Filed: Nov 24, 1986
Inventor
William A. Welsh
Assignee (at issue)
W.R. Grace & Co. Conn.
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.