Granted Patent
Utility
US 6,283,209 · App. 09/503,057
Flexible liner system for borehole instrumentation and sampling
Inventor:
Carl Keller
Patented Case
View Patent ↗
Granted: Sep 4, 2001
Filed: Feb 12, 2000
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.