Granted Patent
Utility
US 5,090,746 · App. 07/501,544
Hinged joint for pipes
Inventor:
Wieland Holzhausen
Patented Case
View Patent ↗
Granted: Feb 25, 1992
Filed: Mar 30, 1990
Inventor
Wieland Holzhausen
Assignee (at issue)
IWK Regler und Kompensatoren 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.