IP Library › Granted Patent US 4,385,271
Granted Patent Utility
US 4,385,271 · App. 06/245,656

Fault monitoring by detecting a polarity difference

Inventors: Moshe Kurtz, Gregory C. Stone
Patented Case View Patent ↗
Granted: May 24, 1983 Filed: Mar 20, 1981
Inventors
Moshe Kurtz
Gregory C. Stone

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 4,385,271
App. No.
06/245,656
Filed
1981-03-20
Granted
1983-05-24
Kind
A