Granted Patent
Utility
US 4,260,568 · App. 06/048,104
Method for feeding waste yarn to an extruder
Inventor:
Fred M. Warzel
Patented Case
View Patent ↗
Granted: Apr 7, 1981
Filed: Jun 13, 1979
Inventor
Fred M. Warzel
Assignee (at issue)
Phillips Petroleum Company
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.