Patents by Inventor Peter Leupin

Peter Leupin 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).

  • Vat dye mixtures, processes for their preparation and their use for dyeing cellulosic fibre materials
    Patent number: 5882359
    Abstract: Vat dye mixtures comprising at least two structurally different dyes which have the formula ##STR1## in which X is phenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or halogen; morpholino; or the radical --SR.sub.3 ; R.sub.1 and R.sub.2 independently of one another are each hydrogen or the radical --NHCO--C.sub.6 H.sub.5, and R.sub.3 is C.sub.1 -C.sub.4 alkyl, or phenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl or halogen, which are suitable for dyeing cellulosic fiber materials and give dyeings with good allround properties, are described.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: March 16, 1999
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Peter Leupin, Roland Zoelper
  • Process for the preparation of 2,3-dibromopropionyl chloride
    Patent number: 5344977
    Abstract: An improved process for the preparation of 2,3-dibromopropionyl chloride, which comprises brominating acrylic acid, adding iron powder or an iron salt to the resultant melt, chlorinating the dibromopropionic acid obtained, and removing the volatile components. The 2,3-dibromopropionyl chloride is obtained in high yield and purity and is an intermediate for synthesising in particular reactive dyes.
    Type: Grant
    Filed: January 22, 1993
    Date of Patent: September 6, 1994
    Assignee: Ciba-Geigy Corporation
    Inventors: Alfons Arquint, Peter Leupin