Granted Patent
Utility
US 4,356,098 · App. 06/187,317
Stable ferrofluid compositions and method of making same
Inventor:
Mark S. Chagnon
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Sep 15, 1980
Inventor
Mark S. Chagnon
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.