Granted Patent
Utility
US 4,723,849 · App. 06/767,329
Compounding blender for plastic materials
Inventor:
Douglas J. Boring
Patented Case
View Patent ↗
Granted: Feb 9, 1988
Filed: Aug 21, 1985
Inventor
Douglas J. Boring
Assignee (at issue)
CONAIR LLC
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.