Storage and reproduction method and apparatus
CA 2258951 A1 · Owner: International Mobile Satellite Organization · Inventors: John, David; Alexander, Paul F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Digital audio recording equipment (12) is used to record modulated signals such as the RF test signals generated by test modems. If the modulated signals are outside the audio frequency range, they are down-converted into the audio frequency range using a mixer (4), local oscillator (6) and a filter (8). The digitally converted data are recorded onto a suitable medium such as a DAT, CD or a computer memory. The data is then disseminated for reproduction by a suitable digital audio player (12'). The reproduced audio signal may be upconverted to the desired radio frequency using a mixer (16) local oscillator , (18) and a filter (20). The reproduced signal may be used to test …
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 June 19, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2019.
- 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.