Granted Patent
Utility
US 5,776,541 · App. 08/774,433
Method and apparatus for forming an irregular pattern of granules on an asphalt coated sheet
Inventors:
James S. Belt, Frank R. Wilgus, Frank A. Wilgus
Patented Case
View Patent ↗
Granted: Jul 7, 1998
Filed: Dec 30, 1996
Inventors
James S. Belt
Frank R. Wilgus
Frank A. Wilgus
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.