Granted Patent
Utility
US 4,883,449 · App. 06/632,081
Device for making grooves in cigarette filters
Inventors:
Richard Heaney, Erik I. Naslund
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Jul 18, 1984
Inventors
Richard Heaney
Erik I. Naslund
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.