Granted Patent
Utility
US 5,241,869 · App. 07/575,556
Device for taking a fluid sample from a well
Inventor:
Jean Czernichow
Patented Case
View Patent ↗
Granted: Sep 7, 1993
Filed: Aug 30, 1990
Inventor
Jean Czernichow
Assignee (at issue)
Gaz de France
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.