Granted Patent
Utility
US 4,972,986 · App. 07/265,833
Circumferential inter-seal for sealing between relatively rotatable concentric shafts
Inventor:
Abraham Lipschitz
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Nov 1, 1988
Inventor
Abraham Lipschitz
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.