Resources Contact Us Home Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE     Firing head for a tubing conveyed perforating gun Image Number 2 for United States Patent #4648470. A firing head for a tubing conveyed perforating gun is shown which is operated by pressuring the interior of the tubing string. A sliding sleeve having a pressure responsive seal area changes position at a predetermined increase in tubing pressure. Movement of the sliding sleeve drains an initially filled, hydraulic cylinder within the interior of the tool. As the cylinder is drained, an associated fluid piston moves to occupy the evacuated chamber. The fluid piston is connected to a firing pin holder which releases the firing pin. Well annulus pressure acts through a port in the tool upon a pressure responsive seal area on the firing pin, thereby propelling the firing pin into a percussion detonator to fire the perforating gun.       Recently Added Patents Active carbon filter for an internal combustion engine System, module, and method for presenting surface symbology on an aircraft display unit Refrigerator Real time implicit user modeling for personalized search Automating identification and isolation of loop-free protocol network problems Nonvolatile memory element and nonvolatile memory device incorporating nonvolatile memory element Channel sensitive power control   Randomly Featured Patents Portable security alarm Vertebral prosthesis and spinal fixation system Apparatus for straightening a cylindrical member Electroless plating process for the manufacture of printed circuit boards Combination stabilizer/hunting knife for compound bow Process for preparing 1,1,1,2-tetrafluoroethane Reducing sebum spreading Communicating apparatus and communicating method Orthogonal-polarization mirau interferometry and beam-splitting module and interferometric system using the same Toaster and cutter © 2006-2008 PatentGenius. All Rights Reserved.