Granted Patent
Utility
US 4,381,255 · App. 06/225,075
Binderless zeolite extrudates and method of producing
Inventors:
Richard J. Nozemack, Chang W. Chi, John J. Schwonke
Patented Case
View Patent ↗
Granted: Apr 26, 1983
Filed: Jan 14, 1981
Inventors
Richard J. Nozemack
Chang W. Chi
John J. Schwonke
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.