Granted Patent
Utility
US 6,197,877 · App. 09/297,362
Dispersants
Inventors:
Dean Thetford, John D. Schofield, Patrick J. Sunderland
Patented Case
View Patent ↗
Granted: Mar 6, 2001
Filed: Apr 30, 1999
Inventors
Dean Thetford
John D. Schofield
Patrick J. Sunderland
Assignee (at issue)
Zeneca Limited
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.