Granted Patent
Utility
US 5,256,172 · App. 07/870,322
Thermally coupled pressure swing adsorption
Inventor:
Bowie G. Keefer
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Apr 17, 1992
Inventor
Bowie G. Keefer
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.