Granted Patent
Utility
US 5,667,675 · App. 08/609,967
Collapsible apparatus for compressing packing material in liquid chromatography columns and methods of use
Inventors:
Richard G. Hatch, Chiko Fan
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: Feb 29, 1996
Inventors
Richard G. Hatch
Chiko Fan
Assignee (at issue)
Varian, 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.