Granted Patent
Utility
US 4,613,578 · App. 06/725,064
Porous zeolite granules stable in aqueous solutions
Inventor:
Elliot P. Hertzenberg
Patented Case
View Patent ↗
Granted: Sep 23, 1986
Filed: Apr 19, 1985
Inventor
Elliot P. Hertzenberg
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.