Constant carrier watchdog
CA 1258492 A · Owner: Tektronix, Inc. · Inventors: Hammond, John A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of the Invention, A constant carrier watchdog circuit for an r.f. modem detects an anomalous constatnt "carrier on" condition in the modem. In response to this anomalous condition a signal is generated and output to the modem. The signal causes the carrier frequency to shift out of the data channel frequency bands so that the anomalous modem does not affect other users on a telecommunicattion network.
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 August 15, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 15, 2006.
- 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.