Circuit for a lossless capacitive pump
CA 2404185 A1 · Owner: Siemens Milltronics Process Instruments Inc. · Inventors: Mercier, Claude
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A capacitive pump circuit suitable for use in loop powered level measurement and time of flight ranging systems. The capacitive pump circuit comprises an input buffer, a level shifter and an output stage. The input buffer receives a clocking signal which is also coupled to the input of the output stage through the level shifter. The output from the input buffer is switched by the output stage to charge a capacitor and generate a voltage output which has the opposite polarity of the voltage supply rail. According to, another aspect, a capacitive voltage doubter circuit is provided which is also suitable for use in loop powered level measurement and time of flight ranging systems.
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 September 19, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 19, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 2024.
- 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.