Patents by Inventor John Holmbald

John Holmbald 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-level data link control packet assembler/disassembler
    Patent number: 4951278
    Abstract: A data communications system has a layered communication architecture including network services protocols including a link layer and higher level protocols, and has IBM or IBM-compatible synchronous data link control (SDLC) devices including a host computer and a plurality of end user devices desiring to communicate across an X.25 packet-switching network (PSN) of the communications system. A packet assembler/disassembler (PAD) support X.25 communication across the PSN between the SDLC-utilizing host computer and the SDLC-utilizing end user device. In one embodiment, separate high level data link control (HDLC) PADs are provided at each end of the PSN operationally associated with the host computer and the plurality of end user devices, respectively.
    Type: Grant
    Filed: August 31, 1988
    Date of Patent: August 21, 1990
    Assignee: Telenet Communications Corporation
    Inventors: Jeffrey Biber, Jeffrey Cohen, John Holmbald, Zon-Hong Hsieh, Douglas Kay, Roy Spitzer