Granted Patent
Utility
US 4,200,296 · App. 05/964,601
Ferrofluid centrifugal seal
Inventors:
Philip Stahl, Ronald Moskowitz, Walter R. Reed
Patented Case
View Patent ↗
Granted: Apr 29, 1980
Filed: Nov 29, 1978
Inventors
Philip Stahl
Ronald Moskowitz
Walter R. Reed
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.