Granted Patent
Utility
US 4,026,680 · App. 05/588,821
Air separation by adsorption
Inventor:
John J. Collins
Patented Case
View Patent ↗
Granted: May 31, 1977
Filed: Jun 20, 1975
Inventor
John J. Collins
Assignee (at issue)
Union Carbide 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.