Granted Patent
Utility
US 4,673,172 · App. 06/808,834
Leveling valve with height limit
Inventor:
Roland Blanz
Patented Case
View Patent ↗
Granted: Jun 16, 1987
Filed: Dec 13, 1985
Inventor
Roland Blanz
Assignee (at issue)
Graubremse GmbH
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.