Technique for use in processing personal telephone calls
CA 2131279 C · Owner: American Telephone And Telegraph Company · Inventors: Rosenthal, Eugene J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a personal communication service (PCS) environment where a call to, a personal telephone number may be routed to a sequence of telephone numbers until the call is answered or abandoned, and where it is possible that the telephone number of the caller is one of the numbers in the sequence the call to the personal telephone, number is processed by a) determining if the automatic numbering identification (ANI), i.e. the telephone number, of the calling telephone is the same as a telephone number of the sequence, and, if so, b) skipping over that telephone number i.e. the, caller's telephone number, so that no attempt is made to complete a PCS call to the calling telephone.
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 31, 1994 and granted February 10, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 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.