Granted Patent
Utility
US 4,811,745 · App. 07/152,213
Method and device for control of by-products from cigarette smoke
Inventors:
Richmond R. Cohen, David J. Gibboni
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Feb 4, 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.