Granted Patent
Utility
US 4,643,437 · App. 06/840,369
Mechanical seal with automatic gap convergence control
Inventors:
Richard F. Salant, William E. Key, Peter Kay
Patented Case
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Granted: Feb 17, 1987
Filed: Mar 17, 1986
Inventors
Richard F. Salant
William E. Key
Peter Kay
Assignee (at issue)
Borg-Warner Industrial Products, 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.