Granted Patent
Utility
US 5,652,398 · App. 08/609,223
Fixed-volume injector with backflush capability
Inventor:
Paul H. Johnson
Patented Case
View Patent ↗
Granted: Jul 29, 1997
Filed: Mar 1, 1996
Inventor
Paul H. Johnson
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.