Method and composition for incorporating radiation-absorbing agents into polymers
CA 2297794 A1 · Owner: Muller, Beat · Inventors: Lally, John Martin; Muller, Achim; Seiferling, Bernhard
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 a method of incorporating dyes into polymeric materials. The method involves: a) providing a high molecular weight polymer precursor having polymerizable or cross-linkable groups; b) providing a functionalized dye having at least one polymerizable or cross-linkable group capable of reacting with the polymerizable or cross-linkable groups on the polymer precursor; c) mixing the high molecular weight polymer precursor with the functionalized dye to form a prepolymerization mixture; d) dispensing the prepolymerization mixture into a mold; and e) applying radiation to the prepolymerization mixture in the mold, thereby bonding dye to polymer precursor …
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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 26, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 26, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 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
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.