Patents by Inventor Stephen K. Sargood

Stephen K. Sargood 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: 5144396
    Abstract: A planar, p-n junction device has electrical contact made to the active region, the capping layer (4) having been selectively removed through a mask (5, 6). The selective removal of the capping layer may be performed prior to a diffusion step in which the junction is formed, or the dopant may be diffused through the capping layer (4) and the selective removal performed subsequently. In the latter instance the capping layer (4) is preferably etched through a second mask (8,9) having a smaller window (9) in register with the window (6) in the mask layer (5) which is used for the diffusion stage. The device finds particular application as a photodiode detector in optical communications.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: September 1, 1992
    Assignee: British Telecommunications public limited company
    Inventor: Stephen K. Sargood