Cross-linked gels of hyaluronic acid and products containing such gels
Patent 4636524 Issued on January 13, 1987. Estimated Expiration Date: 
March 8, 2005. 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.
March 8, 2005. 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 References 3357784 Ultrapure hyaluronic acid and the use thereof Hyaluronate based compositions and cosmetic formulations containing same Polymeric articles modified with hyaluronate Hyaluronate modified polymeric articles Patent #: 4500676 InventorsAssigneeApplicationNo. 06/709977 filed on 03/08/1985US Classes:514/781Cellulose or derivativeExaminersPrimary: Griffin, Ronald W.Attorney, Agent or FirmInternational ClassesA61K 8/72 (20060101)A61K 8/73 (20060101) A61K 47/36 (20060101) A61Q 19/00 (20060101) C08B 37/00 (20060101) C08B 37/08 (20060101) C08F 8/34 (20060101) C08F 8/00 (20060101) C08L 5/08 (20060101) C08L 5/00 (20060101) AbstractDisclosed are cross-linked gels of hyaluronic acid, alone or mixed with other hydrophilic polymers and containing various substances or covalently bonded low molecular weight substances and processes for preparing them. These products are useful in numerous applications including cosmetic formulations and as drug delivery systems. | |
