Apparatus and method of explicit indication of call from emergency call centre
CA 2549277 C · Owner: Research In Motion Limited · Inventors: Islam, M. Khaledul; Willey, William Daniel; Estable, Luis P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Herein are disclosed an apparatus and method of explicit indication of call from emergency call centre. The method includes the steps of forming an emergency signal in relation to the mobile station terminated call; sending the emergency signal to the mobile station on behalf of the emergency call centre; and detecting the emergency signal at the mobile station. The apparatus includes emergency signal forming means for forming an emergency signal in relation to the mobile station terminated call; emergency signal sending means for sending said emergency signal to the mobile station on behalf of the emergency call centre; and emergency signal detecting means for detecting said …
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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 December 18, 2003 and granted August 11, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2025.
- 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
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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.