Granted Patent
Utility
US 5,189,918 · App. 07/530,590
"""Null"" flow sensor"
Inventors:
Stephen D. Etienne, Donald C. Young
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Jun 1, 1990
Inventors
Stephen D. Etienne
Donald C. Young
Assignee (at issue)
Thorn EMI plc
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.