Granted Patent
Utility
US 3,978,199 · App. 05/545,500
Recovering carbon black from waste rubber
Inventors:
Peter Maruhnic, Ronald H. Wolk, Carmine A. Battista
Patented Case
View Patent ↗
Granted: Aug 31, 1976
Filed: Jan 30, 1975
Inventors
Peter Maruhnic
Ronald H. Wolk
Carmine A. Battista
Assignee (at issue)
Hydrocarbon Research, Inc.
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.