Granted Patent
Utility
US 4,502,700 · App. 06/606,585
Ferrofluid linear seal apparatus
Inventors:
Hanumaiah L. Gowda, Kuldip Raj
Patented Case
View Patent ↗
Granted: Mar 5, 1985
Filed: May 3, 1984
Inventors
Hanumaiah L. Gowda
Kuldip Raj
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.