Granted Patent
Utility
US 6,486,249 · App. 09/693,454
Asphalt release agent
Inventors:
Michael A. Dituro, Frances E. Lockwood, Daniel J. Dotson, Jiafu Fang
Patented Case
View Patent ↗
Granted: Nov 26, 2002
Filed: Oct 20, 2000
Inventors
Michael A. Dituro
Frances E. Lockwood
Daniel J. Dotson
Jiafu Fang
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.