Light actuated optical switching device
CA 2082938 A1 · Owner: Bullington, Jeff Allen · Inventors: Evans, Joseph Tate Jr.; Bullington, Jeff Allen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A light activated switching device (10) is disclosed in which the receipt of a light signal is used to switch a light beam between two output ports (14) and (16). The input light beam is reflected from an interface between two regions having different indices of refraction when the light signal is present. The reflected light beam then exits through the first output port (16). In the absence of the light signal, the two regions have the same index of refraction, and the light beam passes through both regions and exits through the second output port (14).
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 May 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 2013.
- 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.