Patents by Inventor Anne Stevens

Anne Stevens has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the production of optically enriched (R)- or (S)-albuterol
    Patent number: 6365756
    Abstract: A process for the production of optically enriched (R)- or (S)-albuterol or (R)- or (S)-albuterol salts by the resolution of a novel ketal derivative 2-(N-t-butylamino)-1-(+2,2-dimethyl-1,2-benzodioxin-6-yl) ethanol, with a chiral tartaric acid derivative.
    Type: Grant
    Filed: November 13, 2000
    Date of Patent: April 2, 2002
    Assignee: Fine Chemical Corporation Limited
    Inventors: Anne Stevens, Roger Hunter, Luigi Nassimbeni, Mino Caira, Janet Scott, Rainer Clauss, Joanne Gibson, Tarron Grimmbacher
  • Chemical process
    Patent number: 5744658
    Abstract: A method of producing 1,1,1,2-tetrafluoroethane in two separation reaction zones involving (1) reaction of trichloroethylene and hydrogen fluoride to produce l,l,l-trifluoro-2-chloroethane and (2) reaction of the 1,1,1-trifluoro-2-chloroethane and hydrogen fluoride to produce 1,1,1,2-tetrafluoroethane wherein both reactions are carried out at superatmospheric pressure, reaction (2) is carried out at a temperature in the range of 250.degree.-450.degree. C., reaction (1) is carried out at a temperature in the range of 200.degree.-400.degree. C. but below that used in reaction (2) and unconverted 1,1,1-trifluoro-2-chloroethane is recycled for further reaction with hydrogen fluoride.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: April 28, 1998
    Assignee: Imperial Chemical Industries PLC
    Inventors: John David Scott, Rachel Anne Steven