Granted Patent
Utility
US 4,468,417 · App. 06/344,216
Prevention of metal tarnish
Inventor:
John T. Garbutt
Patented Case
View Patent ↗
Granted: Aug 28, 1984
Filed: Jan 29, 1982
Inventor
John T. Garbutt
Assignee (at issue)
Grain Processing 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.