Junk basket
Patent 4276931 Issued on July 7, 1981. Estimated Expiration Date: 
October 25, 1999. 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.
October 25, 1999. 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 2663370 3023810 3120872 3283823 3365007 3382925 Well tool Patent #: 4124245 InventorApplicationNo. 06/088188 filed on 10/25/1979US Classes:166/99, WITH JUNK RETRIEVING MEANS166/169, Lateral ports used in well166/319Fluid operatedExaminersPrimary: Novosad, Stephen J.Attorney, Agent or FirmInternational ClassesE21B 21/00 (20060101)E21B 21/10 (20060101) E21B 29/00 (20060101) E21B 27/00 (20060101) AbstractA junk basket having a housing with cutting means on the lower end thereof and junk retaining means supported within the housing, a valve assembly mounted within the housing above the junk retaining means and including a tubular valve housing valve means for controlling flow through the valve housing, pressure responsive operating means for actuating the valve means whereby the valve means is moved between open and closed positions responsive to the stopping and starting of the flow of drilling fluids through the housing, means providing circulating of fluid through the valve housing and the basket housing when the valve means is closed, cam means for supporting the valve means in open position in one position of the cam means and releasing support from the valve means to allow it to close in a second position and stepping means for actuating the cam means between its first and second positions responsive to the starting and stopping of flow of drilling fluid through the housing. | |
