Granted Patent
Utility
US 5,238,060 · App. 07/941,693
Sampling pump with packer
Inventors:
K. Lynn Niehaus, David Fischer
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Sep 8, 1992
Inventors
K. Lynn Niehaus
David Fischer
Assignee (at issue)
OED Environmental Systems, Inc.
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.