Granted Patent
Utility
US 4,608,061 · App. 06/749,784
Normal butane/iso-butane separation
Inventors:
Warren K. Volles, Nelson A. Cusher
Patented Case
View Patent ↗
Granted: Aug 26, 1986
Filed: Jun 28, 1985
Inventors
Warren K. Volles
Nelson A. Cusher
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.