Method and apparatus for caller-controlled receipt and delivery of voice messages
CA 2015243 C · Owner: Messagephone, Inc. · Inventors: Pierce, Byron C.; Pugh, Joel A.; Carter, Howard E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A line interface unit for caller-controlled receipt and delivery of voice and/or data messages over a telephone system having a voice/data message facility, the message facility connectible to at least one calling station and a called station and normally having access prevention circuitry for preventing storage and forwarding of voice/data messages unless predetermined access codes are received and verified by the circuitry. In the preferred embodiment the unit, comprises a switch connected to a central office and having first and second positions and wherein signals are connected directly between the calling station and the central office when the switch is in the first position. The …
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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 April 24, 1990 and granted July 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 2012.
- 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.