Glass powders for dental glass ionomer cements
CA 1292017 C · Owner: Akahane, Shoji · Inventors: Akahane, Shoji; Tomioka, Kentaro; Tosaki, Satoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fluroaluminosilicate glass powder for dental glass ionomer cements has a specific gravity of 2.4 to 3.5 and a mean particle size of 0.2 to 10µm, consists essentially of 20 to 50% by weight of SiO2, 20 to 40% by weight of A?2O3 15 to, 40% by weight of SrO, 1 to 20% by weight of F2 and 0 to 15% by weight of P2O5 on the converted oxide basis and is free, from alkali metal ions such as Li Na, K, Rb and Cs ions, and, Be, Mg (and Ca) and Ba ions of alkali earth metal ions. For further improvements in physical properties 100 parts by, weight of the glass powder are surface-treated with 0.01 to 5 parts by weight of an acid and/or a fluoride.
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
- Granted November 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.