Granted Patent
Utility
US 4,390,903 · App. 06/143,814
Imaging system and method with mid-tone enhancement
Inventor:
Keith H. Pomeroy
Patented Case
View Patent ↗
Granted: Jun 28, 1983
Filed: Apr 23, 1980
Inventor
Keith H. Pomeroy
Assignee (at issue)
American Hoechst 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.