Patents by Inventor Karl J. Zorzi

Karl J. Zorzi 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).

  • High speed modem
    Patent number: 4924456
    Abstract: A modem is disclosed having a data transmission protocol involving lower-speed, full-duplex operation during the connect sequence with a remote modem and an automatic switch to higher-speed, half-duplex operation for data transfer. Further, the modem data transmission involves transparently changing between lower-speed, interactive operation and higher-speed operation based upon data transmission demands. The operation is controlled by a processor monitoring the contents of a transmit data buffer and providing a mode control command to the modem transmitter. The modem also adapts its speed to the quality of the telephone line by fallback or fallforward to a different speed based upon predetermined data frame retransmission criteria.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: May 8, 1990
    Assignee: Racal Data Communications, Inc.
    Inventors: Ronald K. Maxwell, Karl J. Zorzi, Harunori Yoshikawa, Venkat S. Prasad, Fred G. Smith, Ming-Chih Hsieh
  • High speed modem
    Patent number: 4771417
    Abstract: A modem is disclosed having a data transmission protocol involving lower-speed, full-duplex operation during the connect sequence with a remote modem and an automatic switch to higher-speed, half-duplex operation for data transfer. Further, the modem data transmission involves transparently changing between lower-speed, interactive operation and higher-speed operation based upon transmission demands. The operation is controlled by a processor monitoring the contents of a transmit data buffer and providing a mode control command to the modem transmitter. The modem also adapts its speed to the quality of the telephone line by fallback or fallforward to a different speed based upon predetermined data frame retransmission criteria.
    Type: Grant
    Filed: September 18, 1986
    Date of Patent: September 13, 1988
    Assignee: Racal Data Communications, Inc.
    Inventors: Ronald K. Maxwell, Karl J. Zorzi, Harunori Yoshikawa, Venkat Prasad, Fred G. Smith