Transmission bridge for a subscriber's circuit
CA 1138139 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Reuvekamp, Antonius H.J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1-3-1979 1 PHN 9249, "ABSTRACT", Transmission bridge for a subscriber's circuit. A transmission bridge comprising two alternating current circuits having a non-inverting signal input, an inverting signal input and a signal output the non-inverting signal inputs being coupled to associated connecting terminals for the connection of a subscriber's line, the inverting signal inputs being connected to those terminals to which the non-inverting signal inputs of the other alternating current circuits are coupled, the outputs being coupled to the connecting terminals via supply resistors for preventing the antiphase signals such as speech signals, present at the terminals from being attenuated and …
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 December 21, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 21, 1999.
- 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.