Granted Patent
Utility
US 5,904,749 · App. 08/186,900
Gas chromatographic method
Inventors:
Christopher Huk-Shi Chen, Shinn-Der Chang, Chengwen Weng, Yuanming Tang, Ingo Bernd Holzhueter, Samuel H. Hawthorne
Patented Case
View Patent ↗
Granted: May 18, 1999
Filed: Jan 27, 1994
Inventors
Christopher Huk-Shi Chen
Shinn-Der Chang
Chengwen Weng
Yuanming Tang
Ingo Bernd Holzhueter
Samuel H. Hawthorne
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.