Granted Patent
Utility
US 4,811,960 · App. 07/085,745
Fixed valve stem oil seal
Inventors:
Bernard G. Stritzke, Brian F. Rericha
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Aug 10, 1987
Inventors
Bernard G. Stritzke
Brian F. Rericha
Assignee (at issue)
Microdot 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.