Granted Patent
Utility
US 4,988,447 · App. 07/463,701
Reference flow liquid chromatography system with stable baseline
Inventor:
Lance Hellinger
Patented Case
View Patent ↗
Granted: Jan 29, 1991
Filed: Jan 11, 1990
Inventor
Lance Hellinger
Assignee (at issue)
Spectra-Physics, 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.