Interchangeable insert for railroad switches
Patent 5303884 Issued on April 19, 1994. Estimated Expiration Date: 
January 5, 2013. 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.
January 5, 2013. 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 702113 951205 1005209 1033400 1334466 1811620 1829439 InventorApplicationNo. 000499 filed on 01/05/1993US Classes:246/435R, Point246/437Renewable and reenforcedExaminersPrimary: Huppert, Michael S.Assistant: Lowe, Scott L. Attorney, Agent or FirmForeign Patent References
International ClassE01B 007/02Foreign Application Priority Data1990-06-06 MXAbstractThe invention relates to a manganese steel insert to a railroad track switch point of the type designed to have a planar coupling system within both the web of the rail and the switch point of the insert, instead of the conventional curved coupling surface in use at the present. This is achieved by means of an attachment of the same material as the insert (or other steel) on the insert contact surfaces, thus achieving precision plane surfaces during the machining phase.Other References
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