Ringmaster
CA 2096882 A1 · Owner: Hooper, William T.E. · Inventors: Hooper, William T.E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Telephone handsets alert their owner/operators to the presence of an incoming telephone call by producing a distinctive sound commonly referred to as the ring. The tonality of this ring is typically engineered by the handset's manufacturer on a model by model basis, to be a single specific sound. The ring's duration, however is fixed by industry practice to approximately two seconds in length. In this invention, the ring is recordable and programmable both in its tonality, and its duration by the owner/operator, and many such rings can be recorded and maintained at any given time by the invention in its memory bank for eventual play back, when an incoming telephone call is detected. …
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 May 25, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 25, 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.