Patents by Inventor Roger Hunston

Roger Hunston 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 cyclopropylmethylketone
    Patent number: 5254739
    Abstract: A process is described for the production of the known intermediate cyclopropylmethylketone which delivers a high yield, few side products, high reaction efficiency and turnover, and is more viable practically and commercially. In the presence of an excess of a Periodic Table Group I or Group II metal halide or quaternary phosphonium halide, .alpha.-acetyl-.gamma.-butyrolactone is led continuously into a reaction vessel at 170.degree.-200.degree. C. and cyclopropylmethylketone distilled off continuously. The halide is recovered and recycled in the process.
    Type: Grant
    Filed: September 18, 1992
    Date of Patent: October 19, 1993
    Assignee: Ciba-Geigy Corporation
    Inventors: Roger Hunston, Rudolf Waditschatka