Operation indicative background noise in a digital receiver
CA 2073277 C · Owner: Leopold, Raymond Joseph · Inventors: Leopold, Raymond Joseph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Providing a background noise generator in a digital receiver to produce a small, controlled amount of background noise in the audible output of the receiver to provide an indication to the operator of the continued operation of the receiver. A small amount of noise is generated, either separately or in the RF portion of the receiver, and introduced into the receiver either in the, audio portion or the digital portion as background noise, to provide the ambience of a standard receiver.
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 July 7, 1992 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 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.