Granted Patent
Utility
US 4,681,864 · App. 06/754,781
Cracking catalyst
Inventors:
Grant C. Edwards, Jean-Pierre Gilson, Carl V. McDaniel
Patented Case
View Patent ↗
Granted: Jul 21, 1987
Filed: Jul 15, 1985
Inventors
Grant C. Edwards
Jean-Pierre Gilson
Carl V. McDaniel
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.