Patents by Inventor Donald L. Nielson

Donald L. Nielson 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).

  • Portable telephone communication device for the hearing impaired
    Patent number: 4268721
    Abstract: A portable telephone communications device for the hearing impaired can be carried in the pocket of the user and attaches directly to the telephone handset without intrusion. It includes a keyboard and a readout which enables the user to transmit data by means of the keyboard and receive data which is presented on either an electronic display or a printer or both.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: May 19, 1981
    Assignee: SRI International
    Inventors: Donald L. Nielson, David J. Fylstra, Roy H. Stehle