Casting material
CA 2205589 C · Owner: Harke, Stefan · Inventors: Harke, Stefan; Fenzl, Werner; Grathwohl, Stefanie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a casting composition comprising a curable syrup which contains a liquid monomer and polymer components optionally dissolved therein, and an inorganic filler which includes a quartz sand product, in order to simplify the production of white molded articles, it is proposed that a product the, individual grain of which consists in the core essentially of quartz and at the surface essentially of .alpha.-cristobalite (lowtemperature modification) be selected as quartz sand product.
Read the whole patent
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 November 23, 1995 and granted November 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 23, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2017.
- 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.