Patents by Inventor Markus C. Amann

Markus C. Amann 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).

  • Turnable distributed feedback-laser
    Patent number: 5048049
    Abstract: A tunable distributed feedback laser which has an active region and a tuning region which are arranged transversely relative to each other and which can be separately driven in common via a central layer 4.
    Type: Grant
    Filed: December 18, 1990
    Date of Patent: September 10, 1991
    Assignee: Siemens Aktiengesellschaft
    Inventor: Markus C. Amann
  • Semiconductor laser diode
    Patent number: 4352187
    Abstract: A semiconductor laser diode is disclosed with a connection electrode consisting of a chromium/gold alloy on a highly-doped gallium arsenide layer. The gallium arsenide layer is strip-shaped and overlies a further lesser doped layer of gallium aluminum arsenide. The chromium/gold contact has a low-resistance junction only in the region of the more highly doped layer so that a strip-shaped restriction of the current path occurs in the semisconductor body. Accordingly, a laser-active zone which is only strip-shaped is achieved.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: September 28, 1982
    Inventor: Markus C. Amann