Using nitric oxide to reduce reactor fouling during polypropylene graft copolymerization
CA 2248405 C · Owner: Denicola, Anthony J. Jr. · Inventors: Song, Cheng Q.; Denicola, Anthony J. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A graft copolymer comprising a backbone of a propylene polymer material having a vinyl monomer graft polymerized thereto is produced by (1) treating a propylene polymer material with a free radical polymerization initiator (2) treating the propylene, polymer material with at least one grafting monomer capable of being polymerized by free radicals, and (3) removing any unreacted grafting monomer from the graft copolymerized propylene polymer material decomposing any unreacted initiator, and deactivating any residual free radicals in the material wherein (1) and (2) are carried out, in the presence of a continuous feed of nitric oxide. The nitric oxide reduces the buildup of polymer deposits …
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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 September 22, 1998 and granted March 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 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.