Patents by Inventor Thomas Völkel

Thomas Völkel 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).

  • Hydrolysable and polymerizable oxetane silanes
    Patent number: 6096903
    Abstract: Polymerizable and hydrolysable oxetane silanes and in particular silicic acid condensates which can be prepared therefrom are described, which exhibit only a low volume shrinkage on polymerization and produce polymers with high mechanical strength and therefore can be used above all as dental material or constituent thereof.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: August 1, 2000
    Assignee: Ivoclar AG
    Inventors: Norbert Moszner, Thomas Voelkel, Sabine Stein, Volker Rheinberger
  • Hydrolyzable and polymerizable vinylcyclopropane silanes
    Patent number: 6034151
    Abstract: Polymerizable and hydrolyzable vinylcyclopropane silanes and in particular silicic acid condensates which can be prepared therefrom are described, which exhibit only a low volume shrinkage on polymerization and produce polymers with high mechanical strength and therefore can be used above all as dental material or a constituent thereof.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: March 7, 2000
    Assignee: Ivoclar AG
    Inventors: Norbert Moszner, Thomas Voelkel, Frank Zeuner, Sabine Stein, Volker Rheinberger
  • Fine-grained polymerizable compositions flowable under pressure or shear stress
    Patent number: 5886064
    Abstract: A granular, polymerizable composition which contains at least one polymerizable monomer and/or oligomer and a polymerization initiator and optionally an accelerator and at least 70% by wt. filler and additionally 0.5 to 28% by wt. dendrimer and which becomes flowable under compressive or shear stress. The composition can be packed in similar manner to amalgam and is particularly suitable as dental material or for the production of a dental material.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: March 23, 1999
    Assignee: Ivoclar AG
    Inventors: Volker Rheinberger, Norbert Moszner, Thomas Voelkel, Peter Burtscher
  • Bicycloaliphatic 2-methylene-1,3-dioxepanes
    Patent number: 5703249
    Abstract: The present invention relates to novel bicycloaliphatic 2-methylene-1,3-dioxepanes, which are suitable as starting materials for the preparation of polymers and copolymers, preferably of composite and dental materials. The 2-methylene-1,3-dioxepanes according to the invention, which can undergo radical polymerisation with ring opening with only very little volume shrinkage, can be prepared in a simple manner, are easy to purify and to modify chemically, and are characterised by lack of odour and advantageous physical properties.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: December 30, 1997
    Assignee: Ivoclar AG
    Inventors: Volker Rheinberger, Norbert Moszner, Ulrich Salz, Thomas Voelkel