High-strength glass ceramic containing apatite crystals and a large quantity of wollastonite crystals and process for producing same
Patent 4652534 Issued on March 24, 1987. Estimated Expiration Date: 
April 30, 2006. Estimated 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.
April 30, 2006. Estimated 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.Patent ReferencesBiocompatible glass ceramic material Biocompatible ceramic glass Phosphate glass compositions, and glass-ceramic materials, and methods of making the same Method of producing crystallized glass from phosphate glass High strength glass-ceramic containing apatite and alkaline earth metal silicate crystals and process for producing the same Patent #: 4560666 InventorAssigneeApplicationNo. 06/857369 filed on 04/30/1986US Classes:501/5, Binary, ternary, quaternary, etc., metal silicate crystalline phase (e.g., mullite, diopside, sphene, plagioclase, slagcerams free of alumina, etc.)433/201.1, Dental implant construction501/10, Nonsilica and nonsilicate crystalline phase (e.g., spinel, barium titanate, etc.)623/919, Bone65/33.3, Halogen containing phase (e.g., crystalline or noncrystalline, etc.)65/33.7, Alumino-silicate containing phase65/33.8Containing at least 3 percent lithium or lithium oxide (e.g., spodumene, eucryptite, petalite, etc.)ExaminersPrimary: McCarthy, Helen M.Attorney, Agent or FirmInternational ClassC03C 10/00 (20060101)Foreign Application Priority Data1985-04-30 JPAbstractGlass ceramic comprising apatite crystals and at least 50% by weight of wollastonite crystals and a process for producing the same are disclosed. The glass ceramic contains from 45 to 56% by weight of CaO, from 1 to less than 10% by weight of P2 O5, from 30 to 50% by weight of SiO2, from 0 to 5% by weight in total of one or two of MgO and Y2 O3, and from 0 to 5% by weight of one or more of F2, Na2 O, K2 O, Li2 O, Al2 O3, TiO2, ZrO2, SrO, Nb2 O5 and Ta2 O5, with the total content of CaO, P2 O5 and SiO2 being at least 90% by weight. The glass ceramic exhibits excellent biocompatibility and has improved strength. | |
