Granted Patent
Utility
US 6,772,768 · App. 09/839,760
Cigarette filters of shaped micro cavity fibers impregnated with flavorant materials
Inventors:
Lixin Xue, Kent B. Koller, John B. Paine, III
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: Apr 20, 2001
Inventors
Lixin Xue
Kent B. Koller
John B. Paine, III
Assignee (at issue)
Philip Morris Inc.
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.