Patents by Inventor Helga Drescher

Helga Drescher 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).

  • Alkali silicate glass
    Patent number: 6306784
    Abstract: Alkali silicate glasses are described which, in view of their good chemical stability and their optical properties and processing properties, are particularly suitable as a coating or veneering material for ceramic dental frameworks and hence for the production of all-ceramic dental restorations such as crowns or bridges.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: October 23, 2001
    Assignee: Ivoclar AG
    Inventors: Helga Drescher, Martin Frank, Volker Rheinberger, Wolfram Höland
  • Translucent apatite glass ceramic
    Patent number: 6280863
    Abstract: An apatite glass ceramic is described which is characterized by good chemical stability, a low expansion coefficient and high translucence, and is particularly suitable, by itself or together with glasses or other glass ceramics, as a veneering material for ceramic dental restorations.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: August 28, 2001
    Assignee: Ivoclar AG
    Inventors: Martin Frank, Helga Drescher, Wolfram Höland, Volker Rheinberger
  • Chemically stable translucent apatite glass ceramic
    Patent number: 6200137
    Abstract: An apatite glass ceramic is described which is characterized by good chemical stability, a low expansion coefficient and high translucence, and is particularly suitable, by itself or together with glasses or other glass ceramics, as a veneering material for ceramic dental restorations.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: March 13, 2001
    Assignee: Ivoclar AG
    Inventors: Wolfram Höland, Martin Frank, Helga Drescher, Volker Rheinberger
  • Alkali silicate glass
    Patent number: 6121175
    Abstract: Alkali silicate glasses are described which, in view of their good chemical stability and their optical properties and processing properties, are particularly suitable as a coating or veneering material for ceramic dental frameworks and hence for the production of all-ceramic dental restorations such as crowns or bridges.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: September 19, 2000
    Assignee: Ivoclar AG
    Inventors: Helga Drescher, Frank Martin, Volker Rheinberger, Wolfram Holand