IP Library › Granted Patent US 4,217,731
Granted Patent Utility
US 4,217,731 · App. 06/037,858

Fire door

Inventor: Joseph N. Saino
Patented Case View Patent ↗
Granted: Aug 19, 1980 Filed: May 10, 1979
Inventor
Joseph N. Saino

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 4,217,731
App. No.
06/037,858
Filed
1979-05-10
Granted
1980-08-19
Kind
A