Granted Patent
Utility
US 5,657,069 · App. 07/807,522
Method and apparatus for grey level printing
Inventors:
E. Michael Kelly, James R. Prowak
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Dec 13, 1991
Inventors
E. Michael Kelly
James R. Prowak
Assignee (at issue)
EASTMAN KODAK COMPANY
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.