(3-oxoisoindolin-1-ylidine) propandinitrile derivatives and method for preparing the same
CA 2247300 C · Owner: Samsung Electronics Co. Ltd. · Inventors: Suh, Dong-Hack; Choi, Hyun-Cheual; Rhee, Tae-Hyung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Derivatives of (3-oxoisoindolin-1-ylidine)propandinitrile and, a method for preparing the derivatives. The (3-oxoisoindolin-1ylidine)propandinitrile derivatives can be prepared easily and at low cost. Also, the derivatives show good heat resistance at a temperature required for manufacturing an electro-optic device and, can minimize light loss at a near infrared light wavelength range by substituting hydrogen of C-H bond by halogen atom. As a result the derivative of the present invention are useful as an optical material for an electro-optic device. In addition the (3-, oxoisoindolin-1-ylidine)propandinitrile derivatives can be used as an intermediate for synthesizing a new compound having …
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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 September 16, 1998 and granted October 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 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.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.