Granted Patent
Utility
US 5,580,376 · App. 08/428,976
Asphalt improvement
Inventor:
Roger E. Hayner
Patented Case
View Patent ↗
Granted: Dec 3, 1996
Filed: Apr 26, 1995
Inventor
Roger E. Hayner
Assignee (at issue)
Ashland, 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.