Hybrid telephony device
CA 2453780 A1 · Owner: Kralik, James · Inventors: Kralik, James; Rogalski, Gary
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device configured to draw current from one of a PSTN source and a battery source, depending on a mode of operation of the device is disclosed. In a preferred embodiment, the, device includes a circuit that is configured to draw current from the PSTN source during a first, condition and from the battery source during a second condition. Preferably the circuit is, defaulted to draw current from the battery source. The first condition can be associated with an, off-hook condition. The second condition can be associated with an on-hook condition.
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 December 22, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 22, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 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
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.