Granted Patent
Utility
US 6,820,489 · App. 10/646,368
Optical differential pressure sensor
Inventors:
Mark R. Fernald, Timothy J. Bailey, Matthew B. Miller, James M. Sullivan, James Dunphy, Michael A. Davis, Christopher J. Wright, Alan D. Kersey, Martin A. Putnam, Robert N. Brucato, Paul E. Sanders
Patented Case
View Patent ↗
Granted: Nov 23, 2004
Filed: Aug 22, 2003
Inventors
Mark R. Fernald
Timothy J. Bailey
Matthew B. Miller
James M. Sullivan
James Dunphy
Michael A. Davis
Christopher J. Wright
Alan D. Kersey
Martin A. Putnam
Robert N. Brucato
Paul E. Sanders
Assignee (at issue)
Weatherford/Lamb, 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.