Granted Patent
Utility
US 6,028,138 · App. 09/023,851
Phase change ink formulation using urethane isocyanate-derived resins, a polyethylene wax and toughening agent
Inventors:
Daniel R. Hahn, Clifford R. King, Donald R. Titterington, Jeffery H. Banning, Wolfgang G. Wedler
Patented Case
View Patent ↗
Granted: Feb 22, 2000
Filed: Feb 13, 1998
Inventors
Daniel R. Hahn
Clifford R. King
Donald R. Titterington
Jeffery H. Banning
Wolfgang G. Wedler
Assignee (at issue)
Tektronix, Inc.
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.