Personal identification number security system incorporating a time dimension
CA 2184302 C · Owner: At&T Corp. · Inventors: Smith, David B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The security system includes a time dimension in an alpha-numeric personal identification number (PIN) security system to enhance its security yetmaintain the familiar and simple to use PIN system. The alpha-numeric digits comprising the PIN are separated into two or more digit groups that must be entered into the system according to a predefined time sequence in order to positively identify the user and provide security clearance. The time sequence can include time delays between the entry of digit groups or time periods during which the digit groups must be entered.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed August 28, 1996 and granted January 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.