Acute twist nematic (atn) liquid crystal device for optical communication applications
CA 2317609 A1 · Owner: Wong, Charles · Inventors: Chen, Yen-Chen; Wong, Charles; Liu, Jian-Yu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A twisted nematic liquid crystal-based electro-optic modulator with a twist angle between 0~ and 90~, and preferably between 50~ and 80~ is provided. The modulator provides a relatively rapid switching time such as less than about 50 milliseconds, and provides relatively large extinction ratios such as , greater than -25 dB. Preferably the liquid crystal entrance director (216) differs from the polarization direction (222) by a beta angle of about 15~.
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 January 4, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 4, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 4, 2021.
- 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.