Granted Patent
Utility
US 3,972,835 · App. 05/463,326
Fluid cracking catalyst based on silica sol matrix
Inventors:
Gordon Herman Hoffman, Richard J. Nozemack, Curtis Elliott
Patented Case
View Patent ↗
Granted: Aug 3, 1976
Filed: Apr 23, 1974
Inventors
Gordon Herman Hoffman
Richard J. Nozemack
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.