Granted Patent
Utility
US 4,964,995 · App. 07/368,170
Supercritical separation process for complex organic mixtures
Inventors:
Helena L. Chum, Giuseppe Filardo
Patented Case
View Patent ↗
Granted: Oct 23, 1990
Filed: Jun 16, 1989
Inventors
Helena L. Chum
Giuseppe Filardo
Assignee (at issue)
Midwest Research Institute, 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.