Patents by Inventor Georges Lepicard

Georges Lepicard 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: 4177510
    Abstract: Computer data and procedure protection by preventing processes from intering with each other or sharing each other's address space in an unauthorized manner is accomplished in hardware/firmware by restricting addressability to a segmented memory and by a ring protection mechanism.To protect information in segments shared by several processes from misuse by one of these processes a ring protection hardware system is utilized. There are four ring classes numbered 0 through 3. Each ring represents a level of system privilege with level 0 (the innermost ring) having the most privilege and level 3 (the outermost ring) the least. Every procedure in the system has a minimum and a maximum execute ring number assigned to it which specifies who may legally call the procedure. Also maximum write and read ring numbers specify the maximum ring numbers for which a write and/or read operation is permitted.
    Type: Grant
    Filed: December 2, 1974
    Date of Patent: December 4, 1979
    Assignee: Compagnie Internationale pour l'Informatique, CII Honeywell Bull
    Inventors: Marc Appell, Georges Lepicard, Philippe-Hubert de Rivet, John J. Bradley, Benjamin S. Franklin
  • Patent number: 4077058
    Abstract: A multiprogrammable/multiprocessing digital computer system having a process control block for each process in the system, wherein each process control block includes information which specifies the state of a processor at any given time. Associated with each process control block is a decor extension table having information to indicate whether a specified function, such as the emulation of another processor, may be executed in the system. A native mode instruction indicating a specified function for either one instruction or for a plurality of instructions, is first checked to determine proper format, after which a determination is made by means of the decor extension table, as to whether or not the system is capable of executing the specified function indicated by the native mode instruction.
    Type: Grant
    Filed: December 2, 1974
    Date of Patent: February 28, 1978
    Assignee: Compagnie Honeywell Bull
    Inventors: Marc Appell, Jacques Michel Jean Bienvenu, Jean-Claude Marcel Cassonnet, Georges Lepicard