Transparent polyamide compositions with high chemical strength
CA 2086501 C · Owner: Elf Atochem S.A. · Inventors: Blondel, Philippe; Maj, Philippe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to transparent polyamide compositions with a high concentration of chemical agents the process for preparing them and objects obtained from them. The polyamide compositions consist of 1% to 99% and preferably 40% to 90% by weight of a first polyamide composed of aliphatic units with at least 7 C atoms isophtalic and terephtalic diacid units primarily the latter, cycloaliphatic diamine units and 99% to 1% and preferably 60% to 10% by weight of a semi-crystalline polyamide comprising at least 35% and preferably 50% by weight of an aliphatic unit with at least 7 C atoms.
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 December 30, 1992 and granted February 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2014.
- 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.