Signal switching apparatus
CA 2038418 A1 · Owner: Cordle, Kevin G. · Inventors: Cordle, Kevin G.; Austin, James E.; Martin, Thomas F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus is provided for switching traps in and out of a cable television signal path. A plurality of double pole double throw switches is connected in series with the signal path. Each switch has a first actuated position, a second actuated position, and an off position. The switches connect corresponding traps to the signal path in the first actuated positions. In the second actuated positions, the switches provide a through connection in series with the signal path. An open circuit is provided along the signal path when a switch is in the off position. Actuation and disconnect signals transmitted over the cable television network selectively actuate the switches to the first, second, or …
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 March 15, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2013.
- 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.