Granted Patent
Utility
US 4,284,232 · App. 06/057,420
Liquid-liquid centrifugal contacting machines and methods of constructing and operating them
Inventor:
David B. Todd
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Jul 13, 1979
Inventor
David B. Todd
Assignee (at issue)
Baker Perkins Inc.
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.