Patents by Inventor Harald Steindl

Harald Steindl 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).

  • Air entraining agent for concrete and mortar mixtures
    Patent number: 5759259
    Abstract: An air entraining agent based on rosin for a composition which contains cement and which is one of mortar or concrete includes at least one rosin salt which is a reaction product of materials including rosin and from 0.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: June 2, 1998
    Assignee: Krems Chemie Aktiengesellschaft
    Inventors: Marcel Sychra, Harald Steindl