Optical instrument having a variable optical filter
CA 2286009 C · Owner: Youvan, Douglas C. · Inventors: Yang, Mary M.; Youvan, Douglas C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical instrument (10) for use in collecting light from an object (44) the optical instrument (10) having a post-objective waist (34) with a variable optical filter (32) positioned approximately at the post-objective waist (34). The optical instrument (10) for collecting light from the object (44) comprising an objective lens (18) positioned to receive light from the object (44), an exit lens (24) positioned to focus the light at a focal position (26), and a variable optical filter (32) positioned between the objective lens (18) and the focal position (26) approximately at a waist (34) of the light. The optical instrument (10) may be an epifluorescence microscope (12) for use in …
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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 April 3, 1998 and granted August 6, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2020.
- 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
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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.