Granted Patent
Utility
US 3,933,983 · App. 05/415,861
Method of increasing the thermal stability of crystalline zeolites
Inventor:
Curtis Elliott
Patented Case
View Patent ↗
Granted: Jan 20, 1976
Filed: Nov 12, 1973
Inventor
Curtis Elliott
Assignee (at issue)
W. R. Grace & Co.
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.