Granted Patent
Utility
US 4,586,719 · App. 06/646,887
Mechanical seal
Inventors:
Joseph A. Marsi, Winfred J. Wiese, Lawrence I. Takumi, Clark S. Boster, Gordhan K. Vaghasia, Jerel E. Ellison, Alan B. Coleman
Patented Case
View Patent ↗
Granted: May 6, 1986
Filed: Sep 4, 1984
Inventors
Joseph A. Marsi
Winfred J. Wiese
Lawrence I. Takumi
Clark S. Boster
Gordhan K. Vaghasia
Jerel E. Ellison
Alan B. Coleman
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.