Optical sensor element
CA 1188397 A · Owner: Asea Aktiebolag · Inventors: Brogardh, Torgny; Ovren, Christer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a sensor element formed of a crystalline material and which emits reproducible luminescence spectra in response to excitation light spectra. Such a sensor element comprises a first layer of semiconductor material emitting the reproducible luminescence spectra upon excitation by the excitation light spectra and doped with materials providing shallow energy levels and recombination centers. This first layer has a dopant concentration between 1015 to 1018/cm3. The sensor element further comprises at least second and third layers of semiconductor material surrounding the first layer and having low absorption for the excitation light and luminescent light of this first …
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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
- Granted June 4, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 4, 2002.
- 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.