Process and binder for producing ceramic shells as casting moulds
CA 2098494 A1 · Owner: Grossmann, Wolfgang · Inventors: Ballewski, Heinrich; Graf, Herbert; Grossmann, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Essen, 02.10.92, THYSSEN INDUSTRIE AG PZ 3490/PCT ABSTRACT, PROCESS AND BINDER FOR PRODUCING CERAMIC SHELLS AS CASTING MOULDS, The invention relates to a process for the manufacture of ceramic shells for use as moulds in which a) a fusible or removable pattern of a part to be cast is produced, b) the pattern is dipped in a slurry of refractory material and a binder which contains a colloidal aqueous, silica sol and polymers to form a humid coat on the pattern, c) a coarse, refractory powder is sprinkled into the coat d) the coat is dried, e) the steps b), c) an d) are repeated until the shell has obtained the desired thickness. For the manufacture of quickly drying dip coats whose drying …
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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 June 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2013.
- 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.