Granted Patent
Utility
US 5,343,771 · App. 07/915,309
Tool for sampling soil containing volatile organic compound
Inventors:
David E. Turriff, JoAnn L. Johnson, Lloyd E. Jacobs, Nils K. Melberg
Patented Case
View Patent ↗
Granted: Sep 6, 1994
Filed: Jul 20, 1992
Inventors
David E. Turriff
JoAnn L. Johnson
Lloyd E. Jacobs
Nils K. Melberg
Assignee (at issue)
En Chem, 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.