Biocompatible glass ceramic material
Patent 3981736 Issued on September 21, 1976. Estimated Expiration Date: 
September 21, 1993. 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.
September 21, 1993. 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 References3787900 InventorsApplicationNo. 05/576797 filed on 05/12/1975US Classes:501/10, Nonsilica and nonsilicate crystalline phase (e.g., spinel, barium titanate, etc.)501/57, Fluorine501/63, And phosphorus, niobium, or tantalum501/73, Less than 40 percent by weight silica606/76Specialized coating or materialExaminersPrimary: McCarthy, Helen M.Attorney, Agent or FirmInternational ClassesA61L 27/00 (20060101)A61L 27/12 (20060101) C03C 10/00 (20060101) C03C 21/00 (20060101) A61F 2/00 (20060101) Foreign Application Priority Data1973-05-23 DTAbstractThe glass ceramic material of the present invention has the following composition, in weight percent,:About 20 to about 60 percent of silicon dioxide SiO2,about 5 to about 40 percent of phosphorus pentoxide P2 O5,about 2.7 to about 20 percent of sodium oxide Na2 O,about 0.4 to about 20 percent of potassium oxide K2 O,about 2.9 to about 30 percent of magnesium oxide MgO, andAbout 5 to about 40 percent of calcium oxide CaO,and may contain betweenAbout 0.5 and about 3.0 percent of fluorine.The glass ceramic material is produced by melting the mixture of components and subjecting the resulting melt to a specific annealing or tempering treatment to cause formation of nuclei and ceramization. Such glass ceramic material is especially useful as bone and tooth replacement material in humans and animals.Other References
| |
