Patents by Inventor Cornelia Führer

Cornelia Führer 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).

  • Preparations based on aziridino polyethers and the use thereof
    Patent number: 7923485
    Abstract: The invention relates to preparations based on aziridino polymers and comprising monofunctional aziridines and to the use thereof in producing dental materials, especially impression materials.
    Type: Grant
    Filed: August 4, 2003
    Date of Patent: April 12, 2011
    Assignee: 3M ESPE AG
    Inventors: Thomas Klettke, Cornelia Führer, Adrian Eckert, Gunther Eckhardt, Erich Wanek
  • Dental composition comprising ethylene imine compounds and non-reactive accelerators
    Patent number: 7838572
    Abstract: The present invention relates to a composition with enhanced speed of set, especially to a method of making rubber-like elastomers with improved hardening characteristics. In this respect the present invention provides a composition comprising with respect to the cured composition a ethylene imine group containing component A, a SO2—NH group containing component B and an initiator C. Optionally additives like modifiers, fillers, dyes, pigments, thixotropic agents, flow improvers, polymeric thickeners, surfactants, odorous substances, diluters and flavorings can be added.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: November 23, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas Klettke, Cornelia Fuehrer
  • Two-constituent elastomer materials based on alkyl aziridine comprising a catalyst constituent that contains a boric acid complex
    Patent number: 6894144
    Abstract: The invention relates to elastomer materials based on N-alkylaziridino compounds with a base component which contains the aziridino compounds and with a catalyst component which contains at least one acid-acting compound, both components being mixed before use, characterized in that, as acid-acting compound of the catalyst component, one or more boric acid complexes are used which can be obtained by reaction of boric acid and/or a boric acid derivative with at least one OH-functional compound, the OH functions being able to be present wholly or partly protected, and this reaction being carried out either as an upstream reaction between boric acid and/or a boric acid derivative and at least one such OH-functional compound or during or after the preparation of the catalyst component or by mixing the catalyst component with the base component which then contains at least one OH-functional compound.
    Type: Grant
    Filed: September 1, 2000
    Date of Patent: May 17, 2005
    Assignee: 3M Espe AG
    Inventors: Joachim Zech, Gunther Eckhardt, Cornelia Führer, Bernd Gangnus, Andreas Rombach, Oswald Gasser, Thomas Klettke, Erich Wanek
  • Two-component preparations containing epoxy compounds
    Patent number: 6613437
    Abstract: The invention relates to two-component preparations comprising components (I) and (II), wherein at least one component comprises epoxy compounds and the preparations cure by cationic polymerization, initiated by Lewis and/or Brönsted acids, after mixing of the two components, the preparations comprising the Lewis and/or Brönsted acids in the form of precursor compounds which are suitable for the formation of Lewis and/or Brönsted acids.
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: September 2, 2003
    Assignee: 3M ESPE AG
    Inventors: Gunther Eckhardt, Bernd Gangnus, Wolfgang Weinmann, Cornelia Fuehrer