Granted Patent
Utility
US 4,154,528 · App. 05/916,622
Photographic film printer
Inventors:
Charles J. Watson, Walter Hrastnik, John W. Lang
Patented Case
View Patent ↗
Granted: May 15, 1979
Filed: Jun 19, 1978
Inventors
Charles J. Watson
Walter Hrastnik
John W. Lang
Assignee (at issue)
Bell and Howell, LLC
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.