Granted Patent
Utility
US 5,298,225 · App. 08/100,022
Detachable column cartridge gas chromatograph
Inventor:
William R. Higdon
Patented Case
View Patent ↗
Granted: Mar 29, 1994
Filed: Jul 30, 1993
Inventor
William R. Higdon
Assignee (at issue)
Microsensor Technology
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.