Granted Patent
Utility
US 4,491,400 · App. 06/355,203
Dual-color sensitometer
Inventor:
George R. Utting
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Mar 5, 1982
Inventor
George R. Utting
Assignee (at issue)
Victoreen, Inc.
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.