Integrated uninterruptible power supply protection system with novel inverter circuit
CA 2290403 A1 · Owner: Wu, Fu Ning · Inventors: Wu, Fu Ning
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An uninterruptible power supply (UPS) system comprising an inverter for converting a DC voltage into an AC voltage comprising a full-bridge circuit having four silicon controlled rectifier (SCR) switches two pulse control , circuits for generating control voltage signals to turn on alternate pairs of said switches, a time sequencing circuit and a power switch circuit. The full , bridge circuit is directly connected to a positive DC input terminal and is coupled through the power switch circuit to a negative DC input terminal. The time sequencing circuit generates a first pulse signal for controlling the first pulse control circuit and a second pulse signal for controlling the second …
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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, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2020.
- 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.