Patents by Inventor Hubert Dörrer

Hubert Dörrer 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).

  • Suspensions
    Patent number: 7470317
    Abstract: The invention relates to suspensions, to the production of said suspensions, and to the use thereof for accelerating the setting and hardening of cement and mixtures containing the same. According to the invention, said suspensions consist of aluminium sulphate in a quantity of more than 8 wt. % as Al2O3, preferably between 10 and 12 wt. %, and of suspended bentonite in a quantity of between 1 and 7 wt. %. Said suspensions can especially be used as economical and ecological alternatives in the field of wet spraying. The inventive suspensions are free of COD and alkali.
    Type: Grant
    Filed: August 21, 2003
    Date of Patent: December 30, 2008
    Assignee: BK Giulini GmbH
    Inventors: Rudolf Lunkenheimer, Hubert Dörrer, Jochen Stein