Granted Patent
Utility
US 4,547,253 · App. 06/631,962
Device for making grooves in cigarette filters
Inventors:
Richard Heaney, Steven P. Reed
Patented Case
View Patent ↗
Granted: Oct 15, 1985
Filed: Jul 18, 1984
Inventors
Richard Heaney
Steven P. Reed
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.