Granted Patent
Utility
US 4,621,231 · App. 06/622,291
Toroidal sensor coil and method
Inventors:
Theodore M. Heinrich, Lawrence W. Frost
Patented Case
View Patent ↗
Granted: Nov 4, 1986
Filed: Jun 19, 1984
Inventors
Theodore M. Heinrich
Lawrence W. Frost
Assignee (at issue)
Westinghouse Electric Company LLC
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.