Patents by Inventor Erwin C. Hagedorn

Erwin C. Hagedorn 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).

  • Method of making low expansion crystallized glass-ceramics and telescope mirror blanks made thereby
    Patent number: 4285728
    Abstract: Colored and/or transparent, low expansion, crystallized glass-ceramic articles are formed by a method of thermal in situ crystallization from thermally crystallizable glass melts having lithium-containing crystals as the predominant crystalline species. The crystallized glass-ceramics produced in accordance with the method are low expansion substances, illustratively in the range of -10 to +10.sub.x 10.sup.-7 per .degree.C. (0.degree.-300.degree. C.). Telescope mirror blanks can be made from these transparent low expansion crystallized glass-ceramics.
    Type: Grant
    Filed: October 9, 1979
    Date of Patent: August 25, 1981
    Assignee: Owens-Illinois, Inc.
    Inventors: Clarence L. Babcock, Robert A. Busdiecker, Erwin C. Hagedorn
  • Product and process for forming same
    Patent number: 4192688
    Abstract: Colored and/or transparent, low-expansion, crystallized glass-ceramics formed by thermal in situ crystallization from a differently colored crystallizable base glass and having lithium-containing crystals as the predominant crystalline species. The products have coefficients of thermal expansion of less than about 12 x 10.sup.-7 per .degree.C. over the range of 0 to 300.degree. C. Telescope mirror blanks can be made from the transparent, low-expansion, crystallized glass-ceramics.
    Type: Grant
    Filed: February 6, 1975
    Date of Patent: March 11, 1980
    Assignee: Owens-Illinois, Inc.
    Inventors: Clarence L. Babcock, Robert A. Busdiecker, Erwin C. Hagedorn