Electrostatic discharge protection circuit
CA 2177150 C · Owner: Smith, Jeffrey · Inventors: Smith, Jeffrey; Wagner, Glen R.; Webb, Clair C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for protecting an integrated circuit (IC) against electrostatic discharge (ESD) includes a self-triggered silicon controlled rectifier (STSCR) coupled across the internal supply potentials (Vcc Vss) of the integrated circuit. The STSCR exhibits a snap-back in its current versus voltage characteristic which is triggered at a predetermined voltage during an ESD event. As large voltages build up across the chip capacitance, the predetermined voltage of the SCR (30) is triggered at a potential which is sufficiently low to protect the internal junctions of the IC from destructive reverse breakdown. The STSCR comprises a pnpn semiconductor structure which includes an n-well disposed in a …
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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 August 16, 1994 and granted October 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 16, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 16, 2016.
- 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.