Editing Chlorofluorocarbon (section)

====Regulation and DuPont====
In 1978 the United States banned the use of CFCs such as Freon in aerosol cans, the beginning of a long series of regulatory actions against their use. The critical DuPont manufacturing patent for Freon ("Process for Fluorinating Halohydrocarbons", U.S. Patent #3258500) was set to expire in 1979. In conjunction with other industrial peers DuPont formed a lobbying group, the "Alliance for Responsible CFC Policy", to combat regulations of ozone-depleting compounds.<ref>{{cite book |last1=DeSombre |first1=Elizabeth R. |title=Domestic Sources of International Environmental Policy: Industry, Environmentalists, and U.S. Power |date=2000 |publisher=MIT Press |isbn=978-0-262-04179-9 |page=93 }}</ref> In 1986 DuPont, with new patents in hand, reversed its previous stance and publicly condemned CFCs.<ref name="Ethics">{{cite journal |last1=Smith |first1=Brigitte |title=Ethics of Du Pont's CFC Strategy 1975–1995 |journal=Journal of Business Ethics |date=1998 |volume=18 |issue=1 |pages=103–114 |doi=10.1023/A:1005789810145 }}</ref> DuPont representatives appeared before the [[Montreal Protocol]] urging that CFCs be banned worldwide and stated that their new HCFCs would meet the worldwide demand for refrigerants.<ref name="Ethics"/>