Casting collar for dental impression tray
Patent 4300884 Issued on November 17, 1981. Estimated Expiration Date: 
February 28, 2000. 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.
February 28, 2000. 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 2851728 3436829 3461562 Die stone casting for dental restoration Dowel pin positioner Dental dowel pin placement apparatus Patent #: 4243389 InventorApplicationNo. 06/125326 filed on 02/28/1980US Classes:433/74, Dowel pin or positioner therefor433/37Intra-oralExaminersPrimary: Mancene, GeneAssistant: Wilson, John J. Attorney, Agent or FirmInternational ClassA61C 9/00 (20060101)AbstractA method and apparatus for facilitating the formation of dental castings utilizing a dental impression tray. A collar assembly is provided which is substantially oval and forms an upstanding peripheral enclosure around the dental impression tray. A rod transversely spans across the oval member and is retained in notches at the upper edge of the oval member. The rods pass through spherical coupling members from which depend dowel pins which can enter into the negative impression and are used for retaining the teeth which are subsequently formed by a casting process. | |
