Granted Patent
Utility
US 5,189,991 · App. 07/806,736
Solenoid distributing valve for volume flow control
Inventor:
Michael Humburg
Patented Case
View Patent ↗
Granted: Mar 2, 1993
Filed: Dec 12, 1991
Inventor
Michael Humburg
Assignee (at issue)
J. Eberspaecher GmbH & Co. KG
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.