Granted Patent
Utility
US 4,312,640 · App. 06/019,390
Heat-reactivatable adsorbent gas fractionator and process
Inventor:
Marcel G. Verrando
Patented Case
View Patent ↗
Granted: Jan 26, 1982
Filed: Mar 12, 1979
Inventor
Marcel G. Verrando
Assignee (at issue)
Pall 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.