Granted Patent
Utility
US 4,830,384 · App. 07/068,012
Compact long-life magnetic fluid seal
Inventors:
Kuldip Raj, Ronald Moskowitz
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Jun 29, 1987
Inventors
Kuldip Raj
Ronald Moskowitz
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.