Patents by Inventor Reinhart W. H. Engelmann

Reinhart W. H. Engelmann 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 for fabricating index-guided semiconductor laser
    Patent number: 5403774
    Abstract: A method of altering a refractive index, as for an optical waveguide, as in a buried heterostructure laser, by inducing disordering in a region of a semiconductor body comprises exposing a surface portion of the semiconductor body to plasma etching, coating at least a part of the surface portion with an oxide layer, heat treating the semiconductor body.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: April 4, 1995
    Assignee: Siemens Corporate Research, Inc.
    Inventors: Chan-Long Shieh, Joseph L. Mantz, Reinhart W. H. Engelmann
  • Means for a self-aligned multilayer laser epitaxy structure device
    Patent number: 4665525
    Abstract: A method of forming the proper metallization contacts in a multilayer epitaxy laser device is provided. By selecting the proper crystal plane orientation in etching nonplanar features like channels for the device, a differential etch rate in a free-etch can be effected to remove only selected portions of the top layer and to provide self-alignment in the metallization process.
    Type: Grant
    Filed: May 16, 1986
    Date of Patent: May 12, 1987
    Assignee: Hewlett-Packard Company
    Inventors: Donald E. Ackley, Reinhart W. H. Engelmann, Teruko K. Inouye
  • Means and method for a self-aligned multilayer laser epitaxy structure device
    Patent number: 4623427
    Abstract: A method of forming the proper metallization contacts in a multilayer epitaxy laser device is provided. By selecting the proper crystal plane orientation in etching nonplanar features like channels for the device, a differential etch rate in a free-etch can be effected to remove only selected portions of the top layer and to provide self-alignment in the metallization process.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: November 18, 1986
    Assignee: Hewlett-Packard Company
    Inventors: Donald E. Ackley, Reinhart W. H. Engelmann, Teruko K. Inouye
  • Multiple stripe leaky mode laser
    Patent number: 4348763
    Abstract: A semiconductor laser is provided in which multiple stripe regions are optically coupled in leaky mode operation.
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: September 7, 1982
    Assignee: Hewlett-Packard Company
    Inventors: Donald E. Ackley, Reinhart W. H. Engelmann, Dietrich Kerps