Patents by Inventor James Logan

James Logan 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).

  • Patent number: 4028146
    Abstract: Described is a double heterostructure junction laser in which the active region tapers to zero thickness within the structure, causing light to couple into an adjacent, underlying passive waveguide layer. Also described is a laser device in which the passive waveguide layer terminates in a region of increased thickness adjacent a laser output face. In addition, LPE and MBE techniques for fabricating the tapers are described.
    Type: Grant
    Filed: May 20, 1976
    Date of Patent: June 7, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Ralph Andre Logan, James Logan Merz, Franz Karl Reinhart, Harry Gregory White
  • Patent number: 3978426
    Abstract: Described is a double heterostructure junction laser in which the active region tapers to zero thickness within the structure, causing light to couple into an adjacent, underlying passive waveguide layer. Also described is a laser device in which the passive waveguide layer terminates in a region of increased thickness adjacent a laser output face. In addition, LPE and MBE techniques for fabricating the tapers are described.
    Type: Grant
    Filed: March 11, 1975
    Date of Patent: August 31, 1976
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Ralph Andre Logan, James Logan Merz, Franz Karl Reinhart, Harry Gregory White
  • Patent number: D316000
    Type: Grant
    Filed: June 24, 1988
    Date of Patent: April 9, 1991
    Inventors: James Logan, Ronald Redmond, Federick Botts