High melting point crystalline polyamides
CA 2098271 C · Owner: Sage, Jean-Marc · Inventors: Sage, Jean-Marc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Copolyamides having high crystallinity over the whole composition range, a melting enthalpy .DELTA.H > 3.5 cal/g and a melting point T M higher than 270°C and articles manufactured therefrom are disclosed, said copolyamides comprising by, moles:, a) 1 to 99% of a unit A of formula -(NH-R-NHCO-AR1-CO)-, in which R is a -(CH2)n- carbon chain where n is comprised between 4 and 20, and AR1 is the residue from the condensation of terephthalic acid and/or of the diester form thereof; and, b) 99 to 1% of a unit B of formula -(NH-R-NHCO-AR2-CO)-, in which R is the same carbon chain as in unit A and AR2 is the residue from condensation of naphthalene-2,6-dicarboxylic, acid and/or the diester form …
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 June 11, 1993 and granted August 19, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2015.
- 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.