Granted Patent
Utility
US 4,575,102 · App. 06/673,550
Coaxial, multiple-shaft ferrofluid seal apparatus
Inventors:
Kuldip Raj, Hanumaiah L. Gowda
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Nov 20, 1984
Inventors
Kuldip Raj
Hanumaiah L. Gowda
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.