Granted Patent
Utility
US 4,128,626 · App. 05/354,715
Purification of gaseous hydrogen chloride
Inventor:
Dihrendra R. Merchant
Patented Case
View Patent ↗
Granted: Dec 5, 1978
Filed: Apr 26, 1973
Inventor
Dihrendra R. Merchant
Assignee (at issue)
Pennwalt 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.