IP Library Granted Patent US 3,978,199
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.

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Quick Facts
Patent No.
US 3,978,199
App. No.
05/545,500
Filed
1975-01-30
Granted
1976-08-31
Kind
A