Optical devices
CA 1304489 C · Owner: Mallinson, Stephen R. · Inventors: Mallinson, Stephen R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid crystal device (5) having smectic phase liquid crystal material in two transparent states of differing molecular orientation, each state presenting a different refractive index to polarised light transmitted therethrough, may be utilised to perform various optical junctions. For example, switchable waveguides (6,7) a ring resonator or a diffraction grating may be produced by appropriate arrangment of the material in the two states. Figure 1
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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 30, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 2009.
- 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.