Granted Patent
Utility
US 5,013,052 · App. 07/347,084
Oil seal having attached thereto two aligned polytetrafluoroethylene pieces forming seal lips
Inventors:
John D. Butler, Jon A. Chandler
Patented Case
View Patent ↗
Granted: May 7, 1991
Filed: May 3, 1989
Inventors
John D. Butler
Jon A. Chandler
Assignee (at issue)
Federal-Mogul LLC
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.