Granted Patent
Utility
US 4,355,995 · App. 06/250,839
Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same
Inventor:
Richard M. Berger
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Apr 3, 1981
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.