Granted Patent
Utility
US 5,674,401 · App. 08/578,878
Oil monitor with magnetic field
Inventors:
Arby D. Dickert, James F. Kirkpatrick, Eric Johnson, Keith A. Hawn
Patented Case
View Patent ↗
Granted: Oct 7, 1997
Filed: Dec 22, 1995
Inventors
Arby D. Dickert
James F. Kirkpatrick
Eric Johnson
Keith A. Hawn
Assignee (at issue)
Computational 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.