Aromatic copolyamides, processes for their preparation and structures formed therefrom
CA 2088115 A1 · Owner: Miess, Georg-Emerich · Inventors: Klein, Peter; Jung, Holger; Heinrich, Karl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract, Aromatic copolyamides processes for their preparation, and structures formed therefrom Aromatic copolyamides are described which are soluble in organic polyamide solvents and which comprises the recurring structural units of the formula Ia Ib, Ic and, optionally, Id, -OC-R1-CO-NH-R2-NH- (Ia) (Ib), (Ic), -OC-R1-CO-NH-R3-NH- (Id) in which R1 and R2 are mainly unsubstituted divalent aromatic radicals, the valency bonds of which are in the para-position or in a comparable coaxial or parallel position with respect to one another, X is a group of the formula -S- -SO2-, -CO- OR -O-, Y assumes one of the definitions given for X and, R3 is a radical of the formula II of the formula …
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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 January 26, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 26, 2015.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.