Granted Patent
Utility
US 6,826,956 · App. 10/663,840
Differential pressure level control
Inventor:
Russell Van Mathews
Patented Case
View Patent ↗
Granted: Dec 7, 2004
Filed: Sep 17, 2003
Inventor
Russell Van Mathews
Assignee (at issue)
Cargill, Incorporated
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.