Granted Patent
Utility
US 4,955,397 · App. 07/378,351
Cigarette
Inventors:
Robert R. Johnson, Jiunn-Yann Tang
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: Jul 10, 1989
Inventors
Robert R. Johnson
Jiunn-Yann Tang
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.