Granted Patent
Utility
US 4,975,862 · App. 07/293,528
Process and apparatus for the ink control of a printing machine
Inventors:
Guido Keller, Helmut Kipphan
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Jan 5, 1989
Inventors
Guido Keller
Helmut Kipphan
Assignees (at issue)
Gretag Aktiengesellschaft
Heidelberger Druckmaschinen AG
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.