Electromagnetic wave detector
CA 2223539 A1 · Owner: Audier, Marcel · Inventors: Bois, Philippe; Herniou, Eric; Audier, Marcel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This detector comprises: - at least two flat stacked active sensor elements with photoconductors (D1 D2) separated by a common reading contact layer (Cc) the whole being sandwiched between two layers of control contacts (C1 C2); - means of applying control voltages (V1 V2) to each command contact layer (C1, C2) a voltage applied to the common reading contact layer having a value somewhere between the voltages (V1 V2) applied to the command contact layers; - means connected to the common contact layer (Cc) for detecting the difference between the photoconduction currents of the two sensor elements.
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 December 2, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 2, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 2019.
- 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.