Patents by Inventor Gabor Endredi

Gabor Endredi 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).

  • Process and apparatus for determining the carrier concentration in semiconductors
    Patent number: 5237266
    Abstract: The invention relates to apparatus and method for determining the carrier concentration profile of the carrier concentration in semiconductor materials, multi-layer semiconductor structures and semiconductor devices. According to the invention, applied between an ohmic contact and a rectifying contact formed on the semiconductor are a d.c. voltage resulting in a reverse bias, and two periodic excitation signals having frequencies .OMEGA..sub.1 and .OMEGA..sub.2. Frequency .OMEGA..sub.1 is greater than .OMEGA..sub.2 such that .OMEGA..sub.1, .OMEGA..sub.2, their difference (.OMEGA..sub.2 -.OMEGA..sub.2) and their sum (.OMEGA..sub.1 +.OMEGA..sub.2) are in the same order of magnitude. Two components from the semiconductor's electronic response to the excitation are selected for analysis. The first component is the response to the frequency .OMEGA..sub.1 or .OMEGA..sub.2, and the second component is a first order intermodulation product of one of .OMEGA..sub.1 and .OMEGA..sub.2.
    Type: Grant
    Filed: July 11, 1991
    Date of Patent: August 17, 1993
    Assignee: Semiconductor Felvezeto Fizikai Labs. Rt
    Inventors: Gabor Endredi, Peter Tutto
  • Process for electrochemical dissolution of semiconductors
    Patent number: 5202018
    Abstract: The invention relates to the electrochemical dissolution of semiconductors by alternating application of anodic and cathodic direct currents to an electrode formed by contacting a semiconductor material with an electrolyte.
    Type: Grant
    Filed: July 11, 1991
    Date of Patent: April 13, 1993
    Assignee: SEMILAB Felvezeto Fizikai Labortorium Rt.
    Inventors: Tamas Horanyl, Peter Tutto, Gabor Endredi