Method of making a pipe fitting and product
Patent 4047412 Issued on September 13, 1977. Estimated Expiration Date: 
September 13, 1994. 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 13, 1994. 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 1947611 2858787 3220098 3225423 3681960 Method of making pipe fittings Patent #: 3961513 InventorAssigneeApplicationNo. 05/741968 filed on 11/15/1976US Classes:72/58, Expanding hollow work29/890.14Gas and water specific plumbing component makingExaminersPrimary: Gilden, LeonAttorney, Agent or FirmAbstractA method of making a pipe fitting havin three or more legs arranged in any desired shape by deforming a malleable metal tube substantially filled with a constant volume filler material in a single step without the need for secondary bending while maintaining the filler material at constant volume to provide a fitting wherein the variation in wall thickness is less than about 10%. | |
