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US Patent 5336642 - Canasite-apatite glass-ceramics
US Patent Issued on August 9, 1994
Estimated Patent Expiration Date:
September 1, 2013Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
September 1, 2013Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA glass-ceramic biomaterial having high strength and toughness, a family of glasses from which the glass-ceramic biomaterial can be produced, and a method of production. The material has a primary crystal phase of F-canasite and a secondary crystal phase of F-apatite. The glass family is SiO2 --CaO--Na2 O--K2 O--P2 O5 --F. The method may be a single stage heat treatment, or a two stage involving an initial nucleation and a subsequent crystallization. | InventorAssigneeApplicationNo. 114759 filed on 09/01/1993US Classes:501/3, Halogen containing crystalline phase (e.g., fluormica, etc.)501/10, Nonsilica and nonsilicate crystalline phase (e.g., spinel, barium titanate, etc.)501/57FluorineField of Search501/3, Halogen containing crystalline phase (e.g., fluormica, etc.)501/10, Nonsilica and nonsilicate crystalline phase (e.g., spinel, barium titanate, etc.)501/57FluorineExaminersPrimary: Bell, Mark L.Assistant: Jones, Deborah Attorney, Agent or FirmUS Patent References3981736, Biocompatible glass ceramic materialIssued on: 09/21/1976 Inventor: Broemer , et al.4386162, Alkali metal, calcium fluorosilicate glass-ceramic articles Issued on: 05/31/1983 Inventor: Beall4397670, Method of making alkali metal, calcium fluorosilicate glass-ceramic articles Issued on: 08/09/1983 Inventor: Beall4536481, Opal glasses having an apatite opacifying phase Issued on: 08/20/1985 Inventor: Flannery , et al.4643982, High-strength glass-ceramic containing anorthite crystals and process for producing the same Issued on: 02/17/1987 Inventor: Kasuga , et al.4652534, High-strength glass ceramic containing apatite crystals and a large quantity of wollastonite crystals and process for producing same Issued on: 03/24/1987 Inventor: Kasuga4775646, Fluoride-containing Bioglass™ compositions Issued on: 10/04/1988 Inventor: Hench , et al.5536480Method for treating mineral material having organic carbon to facilitate recovery of gold and silver Issued on: 07/16/1996 Inventor: Simmons International ClassesC03C 010/16C03C 003/112 |
