The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 1989
Filed:
Jul. 17, 1986
Jacques Lewiner, 92210 Saint Cloud, FR;
Claude Hennion, 75008 Paris, FR;
Other;
Abstract
In a coded locking device, unlocking of which is controlled by composing any one of two separate codes, namely a code in use known by entitled users and a responsible person or 'first code x' and a secret code or 'second code y', able to be derived from the first code x by a particular law known only to the responsible person, the first composition of the second code y automatically ensures unlocking of the device and, in a way sufficiently postponed for the users to become acquainted with it, the three following operations: invalidation of the first code x, adoption by the device of the second code y as new first code, sensitization of the device to a third code z derived from the preceding second code y by the above low, this third code z serving as the new second code.