Granted Patent
Utility
US 5,773,496 · App. 08/656,058
Polymer enhanced asphalt
Inventor:
William E. Grubba
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: May 31, 1996
Inventor
William E. Grubba
Assignee (at issue)
Koch Industries, 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.