Granted Patent
Utility
US 4,225,640 · App. 05/902,850
Method of reclaiming thermoplastic materials from municipal waste and product produced thereby
Inventor:
Robert A. Erb
Patented Case
View Patent ↗
Granted: Sep 30, 1980
Filed: May 4, 1978
Inventor
Robert A. Erb
Assignee (at issue)
Redmar Investors, 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.