Granted Patent
Utility
US 4,987,744 · App. 07/470,715
Cryogenic distillation with unbalanced heat pump
Inventors:
James R. Handley, Ravindra F. Pahade
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Jan 26, 1990
Inventors
James R. Handley
Ravindra F. Pahade
Assignee (at issue)
Union Carbide Industrial Gases Technology 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.