Granted Patent
Utility
US 5,773,590 · App. 08/835,779
Methods of separating lignin solids and black liquor from tall oil fatty acids
Inventor:
Paul R. Hart
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Apr 8, 1997
Inventor
Paul R. Hart
Assignee (at issue)
Betzdearborn, 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.