Granted Patent
Utility
US 5,137,572 · App. 07/703,811
Emulsifier and method of using in mixing grade emulsions
Inventor:
Dennis Krivohlavek
Patented Case
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Granted: Aug 11, 1992
Filed: May 21, 1991
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.