Granted Patent
Utility
US 6,581,421 · App. 09/796,916
Security system
Inventors:
James Chmela, John F. Chmela
Patented Case
View Patent ↗
Granted: Jun 24, 2003
Filed: Mar 1, 2001
Inventors
James Chmela
John F. Chmela
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.