Fire-resistant cable for transmitting high frequency signals
CA 2073906 C · Owner: American Telephone And Telegraph Company · Inventors: Adriaenssens, Luc Walter; Beggs, Richard Douglas; Nutt, Wendell Glenn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fire-resistant cable which is suitable for the transmission of high frequency signals in a local area network includes a core which comprises a plurality of twisted pairs of insulated conductors and a jacket. Each insulated conductor of each pair includes an elongated metallic member and an insulation system. The insulation system which is characterized by a suitably low dissipation factor includes dual layers, an outer one of which includes a flame-retardant plastic material. Also, the insulation system is characterized by a suitably low dielectric constant and by compatibility with a relatively short pair twist scheme. In one embodiment, the insulation system includes an inner layer of …
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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 July 15, 1992 and granted April 1, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2014.
- 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.