Patents by Inventor Fédéric Rousseau

Fédéric Rousseau 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).

  • Method of producing a proof of presence or of operation of an entity in an identified zone for a duration greater than a given threshold, and monitoring system
    Patent number: 8477038
    Abstract: A method for producing a proof of the presence and/or of the availability of an entity in a site over a period that is greater than or equal to a presence threshold, the method including: successively transmitting messages, the messages being generated from a secret such that the secret may be reconstituted by having the knowledge of a given number of messages that is greater than or equal to a threshold, each message being transmitted over a transmission period whose duration is chosen such that the product of the duration of the transmission period times the threshold is substantially equal to the presence threshold; comparing the secret and a secret candidate generated from messages received by the entity; the proof being produced only if the secret and the secret candidate are equal.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: July 2, 2013
    Assignee: Cassidian SAS
    Inventors: Fédéric Rousseau, Jean-Philippe Deloison