Granted Patent
Utility
US 4,717,481 · App. 06/889,997
Apparatus for improving the separation of fluids of different densities
Inventors:
Bruce E. Staehle, David L. Holbrook
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Jul 28, 1986
Inventors
Bruce E. Staehle
David L. Holbrook
Assignee (at issue)
UOP LLC
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.