Granted Patent
Utility
US 5,554,540 · App. 08/375,019
Method and apparatus for preserving the sensitivity of a thermionic ionization detector
Inventor:
Chinkai Meng
Patented Case
View Patent ↗
Granted: Sep 10, 1996
Filed: Jan 19, 1995
Inventor
Chinkai Meng
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.