Granted Patent
Utility
US 4,258,751 · App. 05/968,482
Slide plate for valves
Inventor:
Jurgen Humpert
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: Dec 11, 1978
Inventor
Jurgen Humpert
Assignee (at issue)
Friedrich Grohe Armaturenfabrik GmbH & Co.
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.