Granted Patent
Utility
US 6,609,738 · App. 09/427,503
Electromagnetic door lock system
Inventors:
Thomas Roth, Dennis E. Wojdan, Vincent J. Frallicciardi, Robert Cook
Patented Case
View Patent ↗
Granted: Aug 26, 2003
Filed: Oct 26, 1999
Inventors
Thomas Roth
Dennis E. Wojdan
Vincent J. Frallicciardi
Robert Cook
Assignee (at issue)
Securitron Magnalock Corporation
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.