Arrangement for measuring the line condition of a subscriber's line circuit by means of a measuring resistor
CA 1109170 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Dijkmans, Eise C.; Brockmann, Klaus-Dieter K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An arrangement for line supervision of a subscriber's line circuit by means of a measuring resistor, the subscriber's line being supplied via an AC/DC converter coupled to a square-wave signal generator. The measuring resistor is inductively coupled to the subscriber's line and to a conductor in which the square-wave signals supplied by the squarewave signal generator are present. A measuring device is provided which is connected to the measuring resistor for measuring the signal across the resistor.
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
- Granted September 15, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 15, 1998.
- 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.