Interface device
CA 2017694 C · Owner: Riedle, Ulrich · Inventors: Riedle, Ulrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an interface device between a two-way transmission channel with analog signals and a four-wire input of a digital communication system. Construction of the interface device in 10 V technology as an integrated module is made possible by operating the transformer (U) in the lower frequency range as an attenuator pad and selecting such a transmitting or terminating resistance that all signaling voltages are transformed in a range that can be evaluated in 10 V technology, whereby to suppress higher frequency disturbance signals the signaling voltages are fed via a lowpass filter (TP) to a ringing signal detecfor (RD) or via a selective bandpass filter (BP) …
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 May 29, 1990 and granted December 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 2012.
- 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.