Granted Patent
Utility
US 4,865,458 · App. 07/177,454
Apparatus for blending granules for a roofing product
Inventor:
Patrick Hahn
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Apr 4, 1988
Inventor
Patrick Hahn
Assignee (at issue)
Georgia-Pacific 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.