Granted Patent
Utility
US 4,407,508 · App. 06/450,339
Single-pole-piece ferrofluid seal apparatus and exclusion seal system
Inventors:
Kuldip Raj, Raoul Casciari
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Dec 16, 1982
Inventors
Kuldip Raj
Raoul Casciari
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.