Condensation copolymers having surpressed crystallinity
CA 2301659 C · Owner: Kupperblatt, Sandra Ann · Inventors: Ark, Wong Fong; Goldberg, Daniel; Simpson, David Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Condensation copolymers are disclosed which are polymerized from a first monomer which is capable of polymerization by condensation polymerization e.g. ring opening lactone polymerization and a second monomer which is , effective to suppress the crystallization of the copolymer. It is disclosed that suppression of the crystallization can provide enhanced mechanical properties in films made from the copolymers. As a result films prepared from , the copolymers of the present invention can have properties rendering them suitable for use as biodegradable trash bags as well as for other uses.
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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 August 25, 1998 and granted December 2, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 25, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 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.
Timeline
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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.