IP Library › Granted Patent US 4,763,937
Granted Patent Utility
US 4,763,937 · App. 06/906,168

Electromagnetic door lock system

Inventors: Ralph A. Sittnick, Jr., Roy Mathers
Patented Case View Patent ↗
Granted: Aug 16, 1988 Filed: Sep 11, 1986
Inventors
Ralph A. Sittnick, Jr.
Roy Mathers

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 4,763,937
App. No.
06/906,168
Filed
1986-09-11
Granted
1988-08-16
Kind
A