Granted Patent
Utility
US 5,377,754 · App. 08/204,876
Progressive fluid sampling for boreholes
Inventor:
Carl Keller
Patented Case
View Patent ↗
Granted: Jan 3, 1995
Filed: Mar 2, 1994
Inventor
Carl Keller
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.