Granted Patent
Utility
US 4,687,589 · App. 06/822,320
Electronheological fluids
Inventors:
Hermann Block, Jeffrey P. Kelly
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Jan 27, 1986
Inventors
Hermann Block
Jeffrey P. Kelly
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.