Granted Patent
Utility
US 6,694,749 · App. 10/274,378
Rotary valve
Inventor:
Roger A. Heron
Patented Case
View Patent ↗
Granted: Feb 24, 2004
Filed: Oct 21, 2002
Inventor
Roger A. Heron
Assignee (at issue)
Oxford Magnet Technology Limited
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.