Polycarbonate composition resistant to gamma radiation
CA 2404524 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Krishnan, Sivaram; Ebert, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A thermoplastic polycarbonate molding composition having improved resistance to gamma radiation-induced yellowing is disclosed. Particularly suitable for the manufacture of devices targeted for medical applications the composition , contains additive amounts of a first stabilizing compound conforming structurally to formula (I) wherein in the embodiment where n is 1 R1 is an , unsubstituted or substituted carbocyclic or heterocyclic aromatic ring system and where in the embodiment where n is 2 R1 is unsubstituted or C1-4-alkyl or , hydroxy substituted phenylene or naphthylene and R2, R3, R4 and R5 , independently of one another are hydrogen C1-25-alkyl groups or phenyl and a , saccharine …
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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 March 30, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 30, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2023.
- 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.