Junk basket and method of removing foreign material from a well
Patent 4059155 Issued on November 22, 1977. Estimated Expiration Date: 
November 22, 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.
November 22, 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 2550228 2613980 2617486 2638988 2657752 2675879 2789790 3814180 InventorAssigneeApplicationNo. 05/706387 filed on 07/19/1976US Classes:166/301, Freeing stuck object, grappling or fishing in well166/66.5, Magnetic166/99, WITH JUNK RETRIEVING MEANS175/237, Means comprises dropped element175/254, Mounted on transverse pivot294/65.5MAGNETExaminersPrimary: Novosad, Stephen J.Attorney, Agent or FirmAbstractAn improved junk basket comprises a tool body having a longitudinally extending passageway therethrough and a magnet assembly disposed in the passageway. A retainer is cooperative between the magnet assembly and the tool body to retain the magnet assembly in a lower position in the passageway and selectively releasable to permit longitudinal movement of the magnet assembly to an upper position in the passageway whereby core cutting apparatus and/or an improved reverse circulation system, also included in the tool, may be employed.Other References
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