Patents by Inventor Wolfgang Huffer

Wolfgang Huffer 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).

  • Fluorescent dyestuffs, processes for their preparation and their use as laser dyestuffs
    Patent number: 4551265
    Abstract: Fluorescent dyestuffs of the general formula ##STR1## wherein R and R.sup.1 independently of one another represent hydrogen, a salt-forming cation, an alkyl radical with 1 to 16 C atoms or an aryl or aralkyl radical which is optionally substituted by non-chromophoric groups,R.sup.2 to R.sup.5 independently of one another represent hydrogen, alkyl, trifluoromethyl, alkoxy, aralkoxy, alkenoxy, aryloxy, halogen or a carboxyl, cyano, alkyl sulphone, aryl sulphone, aralkyl sulphone, carboxamide, sulphonamide or carboxylic acid ester group,o, p, q and s independently of one another represent 1 or 2 andm and n independently of one another denote 0, 1 or 2, it being possible for the sum of m and n to be 2 to 4,processes for their preparation and their use as laser dyestuffs.
    Type: Grant
    Filed: December 30, 1981
    Date of Patent: November 5, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Brinkwerth, Wolfgang Huffer, Roderich Raue, Rudolf Schieder, Helmut Telle
  • Fluorescent dyestuffs, processes for their preparation and their use as laser dyestuffs
    Patent number: 4338258
    Abstract: Fluorescent dyestuffs of the general formula ##STR1## wherein R and R.sup.1 independently of one another represent hydrogen, a salt-forming cation, an alkyl radical with 1 to 16 C atoms or an aryl or aralkyl radical which is optionally substituted by non-chromophoric groups,R.sup.2 to R.sup.5 independently of one another represent hydrogen, alkyl, trifluoromethyl, alkoxy, aralkoxy, alkenoxy, aryloxy, halogen or a carboxyl, cyano, alkyl sulphone, aryl sulphone, aralkyl sulphone, carboxamide, sulphonamide or carboxylic acid ester group,o, p, q and s independently of one another represent 1 or 2 andm and n independently of one another denote 0, 1 or 2, it being possible for the sum of m and n to be 2 to 4,processes for their preparation and their use as laser dyestuffs.
    Type: Grant
    Filed: September 8, 1980
    Date of Patent: July 6, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Brinkwerth, Wolfgang Huffer, Roderich Raue, Rudolf Schieder, Helmut Telle