Patents by Inventor Mark H. David

Mark H. David 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).

  • Patent number: 5432934
    Abstract: An access restriction interface system for use in a computer system of the sort comprising an operating environment and an application program and user interface apparatus, wherein the access restriction system is adapted to limit user access to the computer system by restricting user input through the user interface apparatus and computer output through the user interface apparatus. Preferably the access restriction system comprises a workspace hierarchy characterized by at least one top-level workspace and at least one lower level workspace on which items may be positioned; at least one class hierarchy for items and attributes of items positioned in one or more of the workspaces, the class hierarchy being characterized by a base class and one or more lower level classes; user restrictions selectively assignable to one or more of the workspaces and implemented in the workspace hierarchy; and class restrictions selectively assignable to one or more of the classes and implemented in the class hierarchy.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: July 11, 1995
    Assignee: Gensym Corporation
    Inventors: Michael Levin, Benjamin A. Hyde, Mark H. David