Patents by Inventor Helmut Gebhardt

Helmut Gebhardt 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).

  • Concrete accelerators
    Patent number: 5997630
    Abstract: An accelerating admixture for use with spraying cementitious compositions such as shotcrete comprises (a) a compound selected from aluminium hydroxide, aluminium hydroxysulphate and mixtures thereof, and (b) an acidic substance which essentially does not react with the compound. The preferred acid substances are organic acids.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: December 7, 1999
    Assignee: MBT Holding AG
    Inventors: Terye Angelskar, Helmut Gebhardt, Bernhard Leikauf, Valentina Mader
  • Concrete spraying additives
    Patent number: 5935318
    Abstract: An accelerating admixture for use with cementitious compositions, especially shotcrete, comprises aluminium sulphate and at least one alkanolamine. The admixture also preferably comprises an stabilising agent, which is preferably selected from aqueous stable polymeric dispersions and sepiolite magnesium silicate.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: August 10, 1999
    Assignee: MBT Holding AG
    Inventors: Terje Angelskar, Helmut Gebhardt, Martin Weibel