Granted Patent
Utility
US 5,667,577 · App. 08/658,648
Filled asphalt emulsions containing betaine emulsifier
Inventors:
Roger K. Chatterjee, Charles R. Milburn
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: Jun 5, 1996
Inventors
Roger K. Chatterjee
Charles R. Milburn
Assignee (at issue)
Witco Corporation
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.