Method of detecting hazardous line voltages over a two-wire line
CA 1236882 A · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Hammarberg, Lars E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of detecting hazardous line voltages over a two-wire line for transferring digital information. At one end the line is terminated by a fork and an apparatus for adaptive echo elimination. This apparatus generates a digital signal constituting an unambiguous measure of the difference between the line impedance and the fork impedance. This signal is compared with two digital limiting values and alarm being given should either these two values be exceeded.
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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
- Granted May 17, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 17, 2005.
- 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.