Granted Patent
Utility
US 5,836,570 · App. 08/710,993
Gate valve seat
Inventors:
Robert A. Blenkush, David L. Thomas, Richard Reugemer
Patented Case
View Patent ↗
Granted: Nov 17, 1998
Filed: Sep 25, 1996
Inventors
Robert A. Blenkush
David L. Thomas
Richard Reugemer
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.