Granted Patent
Utility
US 4,655,736 · App. 06/670,110
Method of manufacturing a tobacco smoke filter
Inventor:
Charles H. Keith
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Nov 9, 1984
Inventor
Charles H. Keith
Assignee (at issue)
Brown & Williamson Tobacco 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.