Granted Patent
Utility
US 5,256,710 · App. 07/916,217
Method of producing, using and composition of phenolic-type polymer modified asphalts or bitumens
Inventor:
Dennis Krivohlavek
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Jul 17, 1992
Inventor
Dennis Krivohlavek
Assignee (at issue)
Asphalt Technology LLC.
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.