Granted Patent
Utility
US 4,896,683 · App. 07/258,366
Selective delivery and retention of nicotine by-product from cigarette smoke
Inventors:
Richmond R. Cohen, David J. Gibboni
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Oct 17, 1988
Inventors
Richmond R. Cohen
David J. Gibboni
Assignee (at issue)
HERCULES LLC
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.