Low-density rrim having improved coefficient of linear thermal expansion and heat deflection properties
CA 2204539 A1 · Owner: Basf Corporation · Inventors: Brown, Bari W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention pertains to a low weight low density rigid polyurethane-polyurea reinforced reaction injection molded (RRIM) part having flaked glass reinforcing fibers, dispersed throughout a matrix made by reacting polyisocyanates with a resin containing hydroxy group tertiary amine polyether polyols a blowing agent, and, optionally surfactants chain extenders, and urethane promoting catalysts. The low density RRIM part using flaked glass and the tertiary amine polyether polyols is a low cost alternative to glass fiber reinforced low density parts and the part exhibits a relatively low coefficient of linear thermal expansion and relatively high temperature deflection properties as compared …
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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 May 5, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 5, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2019.
- 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.