IP Library Granted Patent US 4,621,231
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 4,621,231
App. No.
06/622,291
Filed
1984-06-19
Granted
1986-11-04
Kind
A