Granted Patent
Utility
US 5,082,612 · App. 07/638,721
Method of making an oil seal having two lips formed by splitting the blank
Inventors:
John D. Butler, Jon A. Chandler
Patented Case
View Patent ↗
Granted: Jan 21, 1992
Filed: Jan 7, 1991
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.