Granted Patent
Utility
US 5,893,564 · App. 08/862,797
Mechanical face seal assembly
Inventor:
Jibin Yang
Patented Case
View Patent ↗
Granted: Apr 13, 1999
Filed: May 23, 1997
Inventor
Jibin Yang
Assignee (at issue)
Meritor Heavy Vehicle Systems Limited
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.