System for completing air-to-ground telephone calls
CA 2136368 C · Owner: American Telephone And Telegraph Company · Inventors: Amarant, Brenda B.; Dunn, Thomas Arthur; Kocan, Stephen M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for completing air-to-ground telephone calls is arranged so that a call originatirig from an aircraft is received in a ground station and directed to, a special purpose platform disposed in the land-based telecommunications network. The platform, which may be implemented as an interactive voice response system, includes the capability to interact with the caller by (a) collecting billing information, which may be a commercial credit card or a telephone calling card, or, other billing mechanism which can be initiated by a request for connection to a, telephone operator; (b) validating credit cards and telephone calling cards by initiating a query and receiving a response from …
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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 November 22, 1994 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 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.