Patents by Inventor Otto Helmboldt

Otto Helmboldt 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).

  • Use of basic aluminium sulphates as low-alkali set accelerators for cement
    Patent number: 5660625
    Abstract: Improved set accelerating mixtures and their use are disclosed to shorten the period after mixing hydraulically setting building materials, for example cement, up to the transition into the solid phase. The improved set accelerating mixtures comprise basic aluminum sulphates of the formula: Al(OH).sub.a (SO.sub.4).sub.b, in which the subscripts satisfy the conditions:a=3-2b and b=0.05 to 0.4.These basic aluminum sulphates are produced by parallel precipitation from solutions containing aluminum at temperatures usually less than 60.degree. C. by mixing dilute acid solutions and alkaline solutions containing sulphates in the pH range from 5.0 to 8.0 to produce an amorphous, basic aluminum sulphate.
    Type: Grant
    Filed: January 24, 1996
    Date of Patent: August 26, 1997
    Assignee: Giulini Chemie GmbH
    Inventors: Otto Helmboldt, Istvan Potencsik, Johannes Breker, Reinhold Sedelies, Detlev Roggenkamp