Granted Patent
Utility
US 6,259,352 · App. 09/032,966
Door lock system
Inventors:
Leon Yulkowski, Edward J. Yenni
Patented Case
View Patent ↗
Granted: Jul 10, 2001
Filed: Mar 2, 1998
Inventors
Leon Yulkowski
Edward J. Yenni
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.