Granted Patent
Utility
US 4,810,265 · App. 07/139,207
Pressure swing adsorption process for gas separation
Inventors:
Dale A. Lagree, Frederick Wells Leavitt
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Dec 29, 1987
Inventors
Dale A. Lagree
Frederick Wells Leavitt
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.