Granted Patent
Utility
US 4,674,537 · App. 06/840,823
Straight-way & shut-off valve
Inventor:
Konrad Bergmann
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Mar 18, 1986
Inventor
Konrad Bergmann
Assignee (at issue)
American Standard Inc.
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.