Granted Patent
Utility
US 6,029,978 · App. 08/935,245
Grounding and conductivity improvement for ferrofluid seals
Inventors:
Robert M. Pelstring, John C. Dunfield
Patented Case
View Patent ↗
Granted: Feb 29, 2000
Filed: Sep 22, 1997
Inventors
Robert M. Pelstring
John C. Dunfield
Assignee (at issue)
Seagate Technology LLC
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.