Patents by Inventor Jan van Maanen

Jan van Maanen 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).

  • Device for enciphering and deciphering, by means of the DES algorithm, data to be written to be read from a hard disk
    Patent number: 5513262
    Abstract: A device for enciphering and deciphering with the aid of the DES algorithm data to be written to or read from a hard disk, wherein the input of a DES cipher device (25) is coupled, via a converter (26) for converting data words having a word width of 16 bits to data words having a word width of 64 bits, to a bus for transferring data words having a word width of 16 bits to and from a central processor unit, and to a bus for transferring data words having a word width of 16 bits to and from a disk storage unit and wherein the output of the DES cipher device is coupled, via a multiplexer (27) for converting data words having a word width of 64 bits to data words having a word width of 16 bits, to the bus of the central processor unit and to the bus of the disk storage unit.
    Type: Grant
    Filed: February 18, 1993
    Date of Patent: April 30, 1996
    Assignee: Tulip Computers International B.V
    Inventors: Harm W. van Rumpt, Jan van Maanen, Nicolaas J. M. Opdam, Willem J. Vervoorn