Granted Patent
Utility
US 6,045,121 · App. 09/209,083
Bi-directional valve seal mechanism
Inventors:
James E. Barker, Steven K. Neu, LaVern Allen Lawrence
Patented Case
View Patent ↗
Granted: Apr 4, 2000
Filed: Dec 10, 1998
Inventors
James E. Barker
Steven K. Neu
LaVern Allen Lawrence
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.