Granted Patent
Utility
US 5,913,521 · App. 08/921,038
Rotating seal ring component kit for a mechanical split seal
Inventors:
Jan E. Sangren, James S. Porter
Patented Case
View Patent ↗
Granted: Jun 22, 1999
Filed: Aug 29, 1997
Inventors
Jan E. Sangren
James S. Porter
Assignee (at issue)
John Crane Sealol 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.