Granted Patent
Utility
US 4,447,249 · App. 06/408,397
Blowing wool separator method and apparatus
Inventor:
David M. Kopena
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Aug 16, 1982
Inventor
David M. Kopena
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.