Apparatus for electrically isolating a telephone line from a data device
CA 2111038 A1 · Owner: Farkas, Steven Elliot · Inventors: Farkas, Steven Elliot
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A data access arrangement circuit (60) for supplying electrical isolation between a telephone line (11) and a data device, such as a data terminal or a computer connected to a, modem (10). An isolation circuit (17) connected between a first modem circuit (15) having a transmitter (19) a receiver (20), and a controller (18) and a second modem circuit (16) connected to the telephone line (11), couples signals between the first modem circuit (15) and the second modem circuit (16) thereby, electrically isolating the first modem circuit (15) from the second modem circuit (16). The second modem circuit (16) conditions an incoming analog telephone signal received via the …
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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
- Filed December 9, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 9, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 2015.
- 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.