Granted Patent
Utility
US 4,178,352 · App. 05/944,557
Synthesis of type Y zeolite
Inventors:
David E. W. Vaughan, Grant C. Edwards, Michael Barrett
Patented Case
View Patent ↗
Granted: Dec 11, 1979
Filed: Sep 21, 1978
Inventors
David E. W. Vaughan
Grant C. Edwards
Michael Barrett
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.