Granted Patent
Utility
US 6,170,930 · App. 08/917,314
Method for producing gradient tonal representation and a printhead for producing the same
Inventor:
David B. Wallace
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: Aug 25, 1997
Inventor
David B. Wallace
Assignee (at issue)
Compaq Computer 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.