Granted Patent
Utility
US 4,419,690 · App. 06/296,670
Method and apparatus for producing a half-tone reproduction
Inventor:
Philippe Hammes
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: Aug 27, 1981
Inventor
Philippe Hammes
Assignee (at issue)
Crosfield Electronics Limited
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.