Prepreg which is produced by impregnating a base paper with a combination of resin solution and polymer dispersion
CA 2518942 C · Owner: Holger, Arnold · Inventors: Holger, Arnold; Bernd, Reinhardt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to prepregs obtainable by impregnating a base paper with a , thermally crosslinkable impregnating combination and to a process for their , production. The impregnating combination contains a thermally crosslinkable formaldehyde-free resin solution and a polymer dispersion. The mixing ratio of resin solution to polymer dispersion in the impregnating combination is 45:55 to , 10:90 (solid:solid). After drying the prepreg has a degree of crosslinking of at , least 10% and at most 85% and a residual moisture content of 2 to 3 wt.%. The prepregs according to the invention possess better properties than already known formaldehyde-containing and formaldehyde-free …
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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 February 13, 2004 and granted August 5, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2026.
- 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.