Granted Patent
Utility
US 4,869,274 · App. 06/888,213
Cooling apparatus for use in the manufacture of tobacco filters
Inventor:
Richard M. Berger
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Jul 23, 1986
Inventor
Richard M. Berger
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.