Granted Patent
Utility
US 6,440,216 · App. 09/468,401
Apparatus for depositing granules onto an asphalt coated sheet
Inventor:
David P. Aschenbeck
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Dec 20, 1999
Inventor
David P. Aschenbeck
Assignee (at issue)
Owens-Corning Fiberglas Technology, 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.