Granted Patent
Utility
US 4,459,271 · App. 06/363,208
Process for the exchange of crystalline zeolites
Inventors:
John Lim, Michael Brady, Adrian P. Humphries
Patented Case
View Patent ↗
Granted: Jul 10, 1984
Filed: Mar 29, 1983
Inventors
John Lim
Michael Brady
Adrian P. Humphries
Assignee (at issue)
Harshaw/Filtrol Partnership
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.