Granted Patent
Utility
US 4,732,581 · App. 06/861,336
Gas chromatographic method for separating hydrogen isotopes
Inventors:
Christopher H. Cheh, Ronald E. Massey, Otto K. Kveton, Samuel H. Hawthorne, Savtantar K. Sood
Patented Case
View Patent ↗
Granted: Mar 22, 1988
Filed: May 8, 1986
Inventors
Christopher H. Cheh
Ronald E. Massey
Otto K. Kveton
Samuel H. Hawthorne
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.