Fingerprint acquisition sensor
CA 2190544 C · Owner: Lucent Technologies, Inc. · Inventors: Dickinson, Alexander George; Mendis, Sunetra; Mcpherson, Ross
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for detecting topographic variations on an object such as a finger includes an array of sensing elements disposed on a substrate which each, have a parasitic capacitance. An insulating receiving surface is disposed over the, array of sensing elements and is adapted to receive the object such that a sensing, element and a portion of the object located thereabove creates a measurable change, in capacitance with respect to the parasitic capacitance. An electronic circuit is, coupled to the array of sensing elements for measuring the measurable change in, capacitance.
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 November 18, 1996 and granted January 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 18, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 18, 2018.
- 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.