Patents by Inventor Heiner Klehr

Heiner Klehr 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 cellulose ether compounds for increasing the open time and improving the wettability of cement-based mortars
    Publication number: 20190300432
    Abstract: The present invention relates to cellulose ether compounds for increasing the open time and improving the wettability of cement-based mortars. The inventive cellulose ether compounds are formed from cellulose ether with one or more liquid antifoams incorporated therein. The inventive cellulose ether compounds are preferably used as modified cellulose ether in dry mortars for increasing the open time.
    Type: Application
    Filed: March 27, 2019
    Publication date: October 3, 2019
    Inventors: Heiner KLEHR, Uwe BARTZ, Harald KEMPF
  • Alkyl hydroxyalkyl cellulose ethers containing sulfoalkyl groups
    Patent number: 5591844
    Abstract: The present invention relates to alkyl hydroxyalkyl cellulose ethers which contain a sulfoalkyl group as a further substituent, to a process for the preparation of these cellulose ethers and to building material mixtures which are based on gypsum, hydrated lime or cement and contain alkyl hydroxyalkyl cellulose ethers containing sulfoalkyl groups.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: January 7, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Uwe Bartz, Reinhard D onges, Heiner Klehr
  • Alkyl hydroxyalkyl cellulose ethers containing sulfoalkyl substituents
    Patent number: 5395930
    Abstract: The present invention relates to alkyl hydroxyalkyl cellulose ethers which contain a sulfoalkyl group as a further substituent, to a process for the preparation of these cellulose ethers and to building material mixtures which are based on gypsum, hydrated lime or cement and contain alkyl hydroxyalkyl cellulose ethers containing sulfoalkyl groups.
    Type: Grant
    Filed: June 7, 1993
    Date of Patent: March 7, 1995
    Assignee: Hoechst AG
    Inventors: Uwe Bartz, Reinhard Donges, Heiner Klehr
  • Use of carboxymethylated methyl hydroxyethyl cellulose ethers or methyl hydroxypropyl cellulose ethers
    Patent number: 5372642
    Abstract: The present invention relates to the use of carboxymethylated methyl hydroxyethyl cellulose ethers or methyl hydroxypropyl cellulose ethers having a DS.sub.alkyl from 1.0 to 2.0, a DS.sub.carboxyalkyl from 0.005 to 0.6 and an MS.sub.hydroxyalkyl from 0.05 to 1 as an additive to mixtures of hydrated lime and cement, and to the mixtures of hydrated lime and cement obtained in this way.
    Type: Grant
    Filed: June 7, 1993
    Date of Patent: December 13, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Uwe Bartz, Reinhard Donges, Heiner Klehr