Patents by Inventor Samuel D. Epstein

Samuel D. Epstein 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).

  • Encrypting transponder
    Patent number: 4783798
    Abstract: An encrypting transponder provides data security for transmissions between a terminal and a remote computer, network or terminal. The transponder provides positive user and terminal identification before access to a remote computer file is permitted, and further provides for secure message authentication during the course of data transmission. The transponder is passive and operates in response to interrogation from a remote host computer, thus making it useful with many different operating system and hand-shake protocols.
    Type: Grant
    Filed: March 14, 1985
    Date of Patent: November 8, 1988
    Assignee: ACS Communications Systems, Inc.
    Inventors: Stephen W. Leibholz, Samuel D. Epstein