Granted Patent
Utility
US 5,979,874 · App. 08/967,686
Split knife gate valve having a uniformly compressed and constrained resilient gate seat and method for producing the same
Inventors:
David L. Gambetta, Darrel J. DesRochers
Patented Case
View Patent ↗
Granted: Nov 9, 1999
Filed: Nov 10, 1997
Inventors
David L. Gambetta
Darrel J. DesRochers
Assignee (at issue)
Technaflow, Inc.
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.