Granted Patent
Utility
US 6,692,669 · App. 09/837,920
Methods and apparatus for recycling asphalt shingle material into composite board products
Inventor:
Donald J. Mischo
Patented Case
View Patent ↗
Granted: Feb 17, 2004
Filed: Apr 18, 2001
Inventor
Donald J. Mischo
Assignee (at issue)
American Builders & Contractors Supply Co., 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.