Patents by Inventor John P. Edgar

John P. Edgar 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).

  • Incandescent mantles
    Patent number: 5124286
    Abstract: An improved incandescent mantle which is free of radioactive materials and stronger than mantles produced in the past. The present invention provides a mantle comprised of zirconia, yttria, erbia and ceria, which produces a resulting light output and color comparable for practical purposes to that of traditional thorium mantles. Although the invention is particularly adapted to mantles of inverted form, it is also applicable to other forms.
    Type: Grant
    Filed: July 3, 1990
    Date of Patent: June 23, 1992
    Inventor: John P. Edgar
  • Incandescent mantles
    Patent number: 5071799
    Abstract: An improved incandescent mantle which is stronger than mantles produced in the past as well as free of radioactive materials. The present invention provides a mantle comprised of zirconia, yttria and erbia, which produces a resulting light output and color comparable for practical purposes to that of traditional thorium mantles. Although the invention is particularly adapted to mantles of inverted form, it is also applicable to other forms.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: December 10, 1991
    Inventor: John P. Edgar