Granted Patent
Utility
US 5,235,409 · App. 07/744,563
Optical detection system for capillary separation columns
Inventors:
Dean S. Burgi, John C. Helmer, Ring-Ling Chien
Patented Case
View Patent ↗
Granted: Aug 10, 1993
Filed: Aug 13, 1991
Inventors
Dean S. Burgi
John C. Helmer
Ring-Ling Chien
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.