Optical wave guide
CA 1264971 C · Owner: Hirschfeld, Tomas B. · Inventors: Hirschfeld, Tomas B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical wave guide particularly useful in assay apparatus employing total internal reflection of excitation radiation at the interface between the wave guide and a surrounding liquid phase of lower index of refraction. The wave guide in the form of a solid light-transmissive, elongated rod or fiber made typically of glass crystal or, plastic and having preferably a circular cross section is, tapered gradually from an entrance face of relatively large diameter to a substantially smaller diameter at some position longitudinally displaced from the entrance face. In one form the wave guide is formed with a tapering conical input portion coupled to a second portion having a cylindrical …
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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 January 30, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 2007.
- 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.