Method of producing holes in powder metallurgy parts
Patent 3996048 Issued on December 7, 1976. Estimated Expiration Date: 
December 7, 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.
December 7, 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 References 3622313 3738830 3773506 3804575 3844778 InventorAssigneeApplicationNo. 623154 filed on 10/16/1975US Classes:419/5, Making composite or hollow article419/26, Post sintering operation419/49, Hot isostatic pressing (HIP)419/8Powder next to solidExaminersPrimary: Hunt, Brooks H.Attorney, Agent or FirmInternational ClassB22F 5/10 (20060101)AbstractA procedure for providing bores or other internal passages in hot isostatically pressed powder metal articles, especially those formed of nickel- or cobalt-base superalloys in which the passage is defined by a thin walled metal tube filled with refractory oxide (MgO or SiO2), which is embedded in the metal powder. After hot isostatic pressing the refractory oxide core is removed by leaching, leaving a smooth bore in the finished article. | |
