Utilizing vacuum tubes in computer audio circuitry
CA 2425700 A1 · Owner: Memran, Elan · Inventors: Memran, Elan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tube card preferably includes at least one vacuum tube and a DC to DC high voltage converter. The at least one vacuum tube is supplied with high voltage from the DC to DC voltage converter. The tube card may be used as an additional amplification stage for an analog output of a sound card, or as a preamplifier for an analog input of the sound card. A combination tube card includes at least one vacuum tube, the DC to DC high voltage converter and, a sound chip. The sound chip eliminates the need for a stand alone sound card. The at least one vacuum tube is supplied with high voltage from the DC to DC high voltage converter. The combination tube card replaces the need for having separate …
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 April 15, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 15, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2025.
- 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.