Patents by Inventor Christopher D. Hughes

Christopher D. Hughes 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).

  • Security mechanism for a computer system
    Patent number: 5283830
    Abstract: A computer system includes a plurality of programs and a plurality of accessible objects. Each program has an associated program identifier, and at least some of the objects have respective access control lists (ACL). Each ACL entry may comprise a program identifier key and an access permission indication. When a user attempts to access an object by way of a program, an entry in the ACL of the object is selected by matching the entry keys with at least the program identifier of the program, and access is granted or denied on the basis of the access permission indication in the selected entry.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: February 1, 1994
    Assignee: International Computers Limited
    Inventors: Stewart R. Hinsley, Christopher D. Hughes