Granted Patent
Utility
US 5,918,852 · App. 08/990,545
Wide flow range proportional flow valve
Inventor:
Noel Otto
Patented Case
View Patent ↗
Granted: Jul 6, 1999
Filed: Dec 15, 1997
Inventor
Noel Otto
Assignee (at issue)
Automatic Switch Company
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.