Granted Patent
Utility
US 4,310,258 · App. 06/121,427
Ink ribbon lubrication by liquid silicone oil
Inventor:
Michael A. Scott
Patented Case
View Patent ↗
Granted: Jan 12, 1982
Filed: Feb 14, 1980
Inventor
Michael A. Scott
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.