Granted Patent
Utility
US 4,670,059 · App. 06/828,424
Increased solubility of carbon black
Inventors:
David E. Hackleman, Loren E. Johnson, Kenneth A. Norton
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Feb 11, 1986
Inventors
David E. Hackleman
Loren E. Johnson
Kenneth A. Norton
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.