Granted Patent
Utility
US 6,521,208 · App. 09/673,286
Process for preparing a modified zeolite
Inventors:
David Allen Cooper, William E. Cormier, Elliot P. Hertzenberg, Richard J. Hinchey, Bonita K. Marcus
Patented Case
View Patent ↗
Granted: Feb 18, 2003
Filed: Dec 19, 2000
Inventors
David Allen Cooper
William E. Cormier
Elliot P. Hertzenberg
Richard J. Hinchey
Bonita K. Marcus
Assignee (at issue)
PQ Corporation
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.