Granted Patent
Utility
US 4,252,353 · App. 06/033,466
Self-activating ferrofluid seals
Inventors:
Kuldip Raj, Ronald Moskowitz, Raoul Casciari, Alvan F. Chorney
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Apr 26, 1979
Inventors
Kuldip Raj
Ronald Moskowitz
Raoul Casciari
Alvan F. Chorney
Assignee (at issue)
Ferrofluidics Corporation
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.