Granted Patent
Utility
US 4,389,050 · App. 06/398,927
Mechanical seal having a seal insert mounted in a laminated shell
Inventors:
Norman E. Johnson, Harold F. Greiner
Patented Case
View Patent ↗
Granted: Jun 21, 1983
Filed: Jul 16, 1982
Inventors
Norman E. Johnson
Harold F. Greiner
Assignee (at issue)
EG&G 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.