Granted Patent
Utility
US 4,166,773 · App. 05/863,353
Continuous process for separating high boiling, heat sensitive materials
Inventors:
David P. Higley, Gary Culp, John W. Crandall, Scott Farquhar
Patented Case
View Patent ↗
Granted: Sep 4, 1979
Filed: Dec 22, 1977
Inventors
David P. Higley
Gary Culp
John W. Crandall
Scott Farquhar
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.