Patents by Inventor Theo Stahl

Theo Stahl 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).

  • Patent number: 4571246
    Abstract: An improved process for production of discharge resist prints on textile material which contain hydrophobic fibers wherein at least one disperse dyestuff dischargeable to white discharge-resistant disperse dyestuff is applied, in the form of a dye liquor or printing paste, to the textile material and a discharge resist printing paste is printed on the material in the desired pattern, and the material is subsequently subjected to heat treatment at 100.degree. to 230.degree. C., wherein the improvement comprises the discharge resist printing paste containing, as the discharging agent, at least one salt of hydrogen sulphide, polysulphanes, compounds have a thiolate group of the formula --S.sup..crclbar. or a tautomerizable thio-group of the formula .dbd.S, and mixtures thereof.
    Type: Grant
    Filed: September 17, 1984
    Date of Patent: February 18, 1986
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Buhler, Theo Stahl, Konrad Mix, Kurt Roth
  • Patent number: 4421516
    Abstract: An improved process for preparing discharge prints on textile materials containing hydrophobic fibers wherein at least one disperse dyestuff dischargeable to white is applied to the textile material in the form of a dyeing liquor of print paste and also contacted by a pattern-applied discharge resist print paste, and then the material is heat treated at 100.degree. to 230.degree. C., wherein the improvement comprises said discharge resist print paste having, under the heat treatment conditions, a pH value of zero to 3.
    Type: Grant
    Filed: March 10, 1983
    Date of Patent: December 20, 1983
    Assignee: Cassella Aktiengesellschaft
    Inventors: Theo Stahl, Ulrich Buhler
  • Patent number: 4417897
    Abstract: An improved process for preparing white or colored burn-out effects on textile materials containing hydrophobic fibers and cellulose fibers which process comprises applying to the material a dyeing liquor or printing paste containing at least one disperse dyestuff for dyeing the hydrophobic fibers alone or mixed with dyestuff for dyeing the cellulose fibers, applying a burn-out agent to the textile material in the form of a pattern, and then heat-treating the textile material at about 100.degree. to 240.degree. C. whereby the dyestuff is fixed and the burnout effect is produced, wherein the improvement comprises said dyeing liquor or print paste contains at least one disperse dyestuff which is discharged by the burn-out agent.
    Type: Grant
    Filed: March 10, 1983
    Date of Patent: November 29, 1983
    Assignee: Cassella Aktiengesellschaft
    Inventors: Theo Stahl, Ulrich Buhler
  • Patent number: 4398913
    Abstract: In the process for production of discharge reserve prints on textile material comprised of water-repellent fibers or water repellent fibers mixed with cellulose fibers, wherein a disperse dyestuff which is dischargeable to white is applied in the form of a dye liquor or printing paste to the textile material after which said material is dried or incipiently dried, and a discharge reserve printing paste is printed on the material in the desired pattern, and the thus treated material is subsequently subjected to a heat treatment at temperatures of 100.degree. to 230.degree. C., the improvement comprises said disperse dyestuff which is dischargeable to white is a dyestuff of the formula ##STR1## as more fully defined herein and wherein said discharge reserve printing paste contains, as the discharging agent, a base which produces a pH value of at least 8 in a 5% strength aqueous solution.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: August 16, 1983
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Buhler, Joachim Ribka, Kurt Roth, Theo Stahl
  • Patent number: 4386935
    Abstract: An improved process for producing discharge reserve prints on textile materials comprising water-repellent fibers or mixed water-repellent and cellulose fibers wherein a disperse dyestuff which is dischargeable to white is applied to the textile material in the form of a dye liquor or dye printing paste, at least partially drying the textile material, applying a discharge reserve printing paste to the material by printing on the material in the desired pattern and subsequently heating the printed material at temperatures from 100.degree. to 230.degree. C., with the improvement comprising (a) the discharge reserve printing paste containing, as the discharging agent, an alkaline material which produces a pH value of at least 8 in 5% strength aqueous solution and (b) the disperse dyestuff which is dischargeable to white is a disperse dyestuff of the formula ##STR1## as more fully defined herein.
    Type: Grant
    Filed: September 28, 1981
    Date of Patent: June 7, 1983
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Buhler, Klaus Kuhlein, Theo Stahl, Horst Tappe, Kurt Roth