Granted Patent
Utility
US 4,172,885 · App. 05/888,101
Process for the recovery of hydrogen from ammonia purge gases
Inventor:
Eli Perry
Patented Case
View Patent ↗
Granted: Oct 30, 1979
Filed: Mar 20, 1978
Inventor
Eli Perry
Assignee (at issue)
Monsanto Company
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.