Granted Patent
Utility
US 4,180,553 · App. 05/888,256
Process for hydrogen recovery from ammonia purge gases
Inventors:
Harold R. Null, Eli Perry
Patented Case
View Patent ↗
Granted: Dec 25, 1979
Filed: Mar 20, 1978
Inventors
Harold R. Null
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.