Granted Patent
Utility
US 6,194,621 · App. 08/663,038
Production of difluoromethane
Inventors:
Paul David Bernard Bujac, Jane Lesley Butcher
Patented Case
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Granted: Feb 27, 2001
Filed: Jun 11, 1996
Inventors
Paul David Bernard Bujac
Jane Lesley Butcher
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.