Anisotropic melt polyesters of 6-hydroxy-2-naphthoic acid
CA 1207492 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Harris, John F. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Melt-processible polyester which is optically anisotropic in the melt phase and which consists essentially of the following molar amounts of the recurring units, with the sum of the molar amounts being 100%:, (a) about 20 to about 85% of, (b) about 15 to about 80% of approximately equimolar amounts of, (i), (ii), where in each of X1, X2, X3, and X4 is, independently selected from H Cl, and CH3;, Ar is selected from 1,4-phenylene 1,3-phenylene, 4,4'-oxybiphenylene, 4,4'-biphenylene and 2,6-naphthylene;, Ar1 is selected from n is 0 or 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 July 8, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 8, 2003.
- 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.