Granted Patent
Utility
US 6,383,365 · App. 09/442,154
Low softening point petroleum pitch and sealer
Inventors:
D. Chris Boyer, Patricia K. Doolin
Patented Case
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Granted: May 7, 2002
Filed: Nov 16, 1999
Inventors
D. Chris Boyer
Patricia K. Doolin
Assignee (at issue)
Marathon Ashland Petroleum 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.