Telephone bar device
CA 2174956 C · Owner: De La Haye, Lance Tye · Inventors: Smith, Eric Timothy; Aitken, Michael William; De La Haye, Lance Tye
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stand-alone toll-barring device, powered from the telephone line voltage or from an external supply. In its basic form it comprises means to recognise a user's personal identification number (PIN) as it is dialled in from a telephone or similar peripheral device, means to recall rights (if any) corresponding to that PIN from a memory table, and means to assess whether a number being dialled just after entry of the PIN is permitted under those rights. Emergency numbers and incoming calls are not barred. If the number is not permitted the call is immediately, interrupted. Reprogramming of the data is provided by means of a further PIN. The device may be installed within a telephone or …
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 October 26, 1994 and granted September 24, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 2016.
- 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.