Granted Patent
Utility
US 6,183,023 · App. 09/197,144
Door with integrated fire exit device
Inventor:
Leon Yulkowski
Patented Case
View Patent ↗
Granted: Feb 6, 2001
Filed: Nov 20, 1998
Inventor
Leon Yulkowski
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.