Granted Patent
Utility
US 6,232,491 · App. 09/298,999
Purification process for removal of impurities in acetic acid-ethylene reactions
Inventors:
Malcolm J. Cunnington, Mohammed Hussain Khan, Witold Franciszek Pacynko
Patented Case
View Patent ↗
Granted: May 15, 2001
Filed: Apr 26, 1999
Inventors
Malcolm J. Cunnington
Mohammed Hussain Khan
Witold Franciszek Pacynko
Assignee (at issue)
BP Chemicals 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.