Granted Patent
Utility
US 4,266,786 · App. 06/066,279
Mechanical seal assembly
Inventor:
Winfred J. Wiese
Patented Case
View Patent ↗
Granted: May 12, 1981
Filed: Aug 13, 1979
Inventor
Winfred J. Wiese
Assignee (at issue)
BorgWarner 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.