Granted Patent
Utility
US 3,989,569 · App. 05/548,281
Continuous copying method
Inventor:
Douglas A. Newman
Patented Case
View Patent ↗
Granted: Nov 2, 1976
Filed: Feb 10, 1975
Inventor
Douglas A. Newman
Assignee (at issue)
Columbia Ribbon & Carbon Mfg. Co., 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.