Granted Patent
Utility
US 5,216,149 · App. 07/711,546
Controlled catalytic and thermal sequential pyrolysis and hydrolysis of mixed polymer waste streams to sequentially recover monomers or other high value products
Inventors:
Robert J. Evans, Helena L. Chum
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Jun 7, 1991
Inventors
Robert J. Evans
Helena L. Chum
Assignee (at issue)
Midwest Research Institute, 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.