Granted Patent
Utility
US 6,778,078 · App. 09/429,908
Integrated emergency signaling load management system
Inventors:
Wei Han, Robert John Spangler
Patented Case
View Patent ↗
Granted: Aug 17, 2004
Filed: Oct 29, 1999
Inventors
Wei Han
Robert John Spangler
Assignee (at issue)
Federal Signal 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.