Granted Patent
Utility
US 4,426,092 · App. 06/393,580
Mechanical seal assembly
Inventor:
Winfred J. Wiese
Patented Case
View Patent ↗
Granted: Jan 17, 1984
Filed: Jun 30, 1982
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.