Granted Patent
Utility
US 5,463,139 · App. 08/268,659
Production of difluoromethane
Inventors:
Jane Lesley Butcher, Thomas Anthony Ryan, Leslie Burgess
Patented Case
View Patent ↗
Granted: Oct 31, 1995
Filed: Jun 29, 1994
Inventors
Jane Lesley Butcher
Thomas Anthony Ryan
Leslie Burgess
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.