Patents Assigned to 501 Espe Stiftung & Co. Produktions-Und
  • Two-stage photocuring process for a dental composition
    Patent number: 5472991
    Abstract: The invention relates to photopolymerizable dental compositions of ethylenically unsaturated monomers and/or polymers thereof which are curable in two curing steps. Besides being comprised of fillers, said compositions also contain a photoinitiator component I having a light absorption maximum of <450 nm and a molar extinction of the light absorption of <10 at wavelengths of 470 nm or higher, and a photoinitiator component II having a molar extinction of the light absorption of >20 at least at one wavelength of at least >450 nm.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: December 5, 1995
    Assignee: 501 Espe Stiftung & Co. Produktions-Und
    Inventors: Werner Schmitt, Peter Jochum, Klaus Ellrich