Granted Patent
Utility
US 5,009,239 · App. 07/286,687
Selective delivery and retention of aldehyde and nicotine by-product from cigarette smoke
Inventors:
Richmond R. Cohen, Gary A. Luzio
Patented Case
View Patent ↗
Granted: Apr 23, 1991
Filed: Dec 20, 1988
Inventors
Richmond R. Cohen
Gary A. Luzio
Assignee (at issue)
Hoechst Celanese 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.