Patents by Inventor Constant Hardy

Constant Hardy 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).

  • Secured access checking system enabling the automatic transfer of entitlement to produce keys
    Patent number: 6380843
    Abstract: A secured system of access checking using a portable storage carrier (C) on which there is recorded an electronic key (CL), a digital data processing instrument (LE) for the production of keys, and an electronic lock (L) function capable of authorizing access should the storage carrier have the requisite electronic key. To transfer an entitlement to produce keys (CL) from one production digital data processing instrument (LE) to another, it is loaded with a new public key (K′) and the signature (CER′) of this key.
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: April 30, 2002
    Assignee: La Poste
    Inventors: Didier Guerin, Constant Hardy, Marc Girault, Marie-Josèphe Revillet