Granted Patent
Utility
US 5,609,183 · App. 08/389,452
Butterfly valve with sensing coil
Inventor:
Christopher Jack Parker
Patented Case
View Patent ↗
Granted: Mar 11, 1997
Filed: Feb 16, 1995
Inventor
Christopher Jack Parker
Assignee (at issue)
BTR 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.