Patents by Inventor Thomas J. Kingzett

Thomas J. Kingzett 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).

  • Semiconductor-oxide etchant
    Patent number: 4052253
    Abstract: An etchant for semiconductors having a high preferential etch rate for doped silica particularly phosphorous doped silica, consisting of a 20:20:1 mixture, by volume, of 37% hydrochloric acid, deionized water, and 49% hydrofluoric acid. The etchant is particularly useful in a semiconductor process wherein an emitter opening is washed out following the diffusion thereof.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: October 4, 1977
    Assignee: Motorola, Inc.
    Inventor: Thomas J. Kingzett