Granted Patent
Utility
US 6,551,452 · App. 09/917,868
Process for digesting woodchips and digester additives
Inventors:
George K. Wai, Abdul Q. Khan
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Jul 26, 2001
Inventors
George K. Wai
Abdul Q. Khan
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.