Granted Patent
Utility
US 5,203,887 · App. 07/804,752
Adsorbent beds for pressure swing adsorption operations
Inventor:
Lee J. Toussaint
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Dec 11, 1991
Inventor
Lee J. Toussaint
Assignee (at issue)
Praxair 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.