Granted Patent
Utility
US 6,767,956 · App. 10/220,376
Extrusion process
Inventors:
Riaz Ahmad Choudhery, Kenneth Andrew Murray, Stephen Barry Downing, David John Southgate
Patented Case
View Patent ↗
Granted: Jul 27, 2004
Filed: Mar 11, 2003
Inventors
Riaz Ahmad Choudhery
Kenneth Andrew Murray
Stephen Barry Downing
David John Southgate
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES 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.