Optical filter
CA 2314857 A1 · Owner: Cheng, Yihao · Inventors: Cheng, Yihao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention discloses and optical filtering arrangement wherein a filter element having, a coated substrate is disposed such that its ports on one side face the substrate instead of, facing the coating upon the substrate. Hence when the filter is positioned a , distance from the ports, its coating side faces away from the ports while its substrate faces the ports. In, this arrangement stress applied by adhesives or solder upon the coating can be eliminated.
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 August 2, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 2, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 2, 2022.
- 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.