Granted Patent
Utility
US 4,357,950 · App. 06/153,560
Tobacco smoke filter having improved tar/carbon monoxide ratio
Inventor:
Richard M. Berger
Patented Case
View Patent ↗
Granted: Nov 9, 1982
Filed: May 27, 1980
Inventor
Richard M. Berger
Assignee (at issue)
American Filtrona 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.