Ceramic spheroids having low density and high crush resistance
CA 1251223 A · Owner: Minnesota Mining And Manufacturing Company · Inventors: Laird, James A.; Beck, Warren R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure CERAMIC SPHEROIDS HAVING LOW DENSITY, AND HIGH CRUSE1 RESISTANCE Ceramic spheroids having:, A. a core made by firing raw materials comprising about:, 50-99.8 parts by weight mineral particulates; 0.l to 50 parts by weight silicon carbide; and 0.l to 15 parts by weight binder (e.g. bentonite); and B. an outer shell comprising Al2O3 or MgO. More alumina or magnesium oxide is contained in the outer shell than in the core. The core of the ceramic spheroid has closed cell microporosity. The inventive spheroids are characterized by a density less than 2.2 g/cc and can be readily made to have a density less than 1 g/cc. These ceramic spheroids combine high strength (due …
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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
- Granted March 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 14, 2006.
- 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.