Granted Patent
Utility
US 4,780,116 · App. 07/123,370
Low temperature preparative gas chromatography apparatus
Inventors:
Christopher H. Cheh, Samuel H. Hawthorne, Ronald E. Massey, Otto K. Kveton, Savtantar K. Sood
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: Nov 20, 1987
Inventors
Christopher H. Cheh
Samuel H. Hawthorne
Ronald E. Massey
Otto K. Kveton
Savtantar K. Sood
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.