Granted Patent
Utility
US 4,293,322 · App. 06/143,099
Distillative separation of carbon dioxide from hydrogen sulfide
Inventors:
James M. Ryan, Arthur S. Holmes
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Apr 23, 1980
Inventors
James M. Ryan
Arthur S. Holmes
Assignee (at issue)
Helix Technology Inc.
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.