Granted Patent
Utility
US 5,504,119 · App. 08/339,450
Recycling cellulose esters from the waste from cigarette manufacturing
Inventor:
John B. Hopkins, Jr.
Patented Case
View Patent ↗
Granted: Apr 2, 1996
Filed: Nov 14, 1994
Inventor
John B. Hopkins, Jr.
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.