Patents by Inventor Michael L. Cognevich

Michael L. Cognevich has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5842501
    Abstract: A pilot operated safety relief valve assembly including a main safety relief valve (14) and a pilot valve (36) connected directly to the relief valve (14) is disclosed. Main safety relief valve (14) has a planar mounting face (76) in contact relation with opposed mating mounting face (78) of the pilot valve (36). Dome ports (72 and 84) in contacting planar faces (76, 78) are in alignment with each other without any tubing therebetween. Exhaust ports (74 and 86) in contacting planar faces (76, 78) are in alignment with each other without any tubing therebetween. Inlet sensing ports (75D, 75E, 65D, 65E) as shown in the embodiments of FIGS. 9 and 10 in contacting planar faces (76D, 76E, 78D, 78E) are in alignment with each other without any tubing therebetween. A fluid pressure pickup fitting (48) has a port (118) which communicates with the fluid passage (50) to the pressure vessel. A test connection (120) is connected to the fluid pressure pickup fitting (48).
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: December 1, 1998
    Assignee: Flow Safe, Inc.
    Inventors: Walter W. Powell, Michael L. Cognevich
  • Patent number: 5738333
    Abstract: A pressure relief valve (10) for a pilot operated fluid system (FIG. 4) for a pressure vessel (12). Pressure relief valve (10) has a valve body (14) forming a valve chamber (16) accessible by upper cover plate (24). A cylindrical housing (32) is mounted in the valve chamber (16). A valve stem (38) has a diaphragm assembly (40) on its upper end and a valve assembly (42) on its lower end. Diaphragm assembly (40) includes a rolling loop diaphragm (44) fitting between opposed surfaces (36, 60) of housing (32) and piston member (56). A circular guide (66) on valve stem (38) fits within housing (32) for guiding the movement of the valve stem (38). Valve assembly (42) is connected to valve stem (38) about a ball and socket joint formed by ball (70) on the valve stem (38) and a socket (84) on the valve assembly (42).
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: April 14, 1998
    Assignee: Flow Safe, Inc.
    Inventors: Michael L. Cognevich, Neal Murray
  • Patent number: 5141416
    Abstract: A method of manufacturing a plunger for a downhole reciprocating oil well pump for use in sandy environments including the step of machining a metal plunger to the required base configuration with an external cylindrical pump surface having a diameter of about 0.025 inches less than the design diameter, grit blasting the plunger cylindrical pump surface to achieve a textured surface thereon, heating the plunger, flame spraying a thin layer of ceramic composite on the plunger cylindrical pump surface, repeating the flame spraying steps sequentially until the diameter of the cylindrical pump surface having the ceramic composite thereon is about 0.015 to 0.020 inches above the design diameter, cooling the plunger and grinding the ceramic covered plunger pump surface to the design diameter.
    Type: Grant
    Filed: February 14, 1991
    Date of Patent: August 25, 1992
    Assignee: Dover Resources, Inc.
    Inventors: Michael L. Cognevich, Shannon B. Sixkiller
  • Patent number: 4960173
    Abstract: A mechanism for accurately positioning a well tool in axially concentric relationship to a well conduit comprises a housing having a plurality of stabilizer linkages mounted thereon with one end of each linkage being pivotally secured to the housing and the other end free to move in an axial direction. A compression spring engages a force transmitting connection to the other ends of the stabilizer linkages to bias same to a radially expanded position engaging the conduit wall. The connection between the compression spring and the stabilizer linkage includes two telescopically related sleeve elements which are secured together by a shear screw. In the event that the stabilizer linkage becomes stuck in the well, upward jarring movements of the housing will shear the shear screw and permit the stabilizer linkages to collapse radially inwardly and thus permit removal from the well.
    Type: Grant
    Filed: October 26, 1989
    Date of Patent: October 2, 1990
    Assignee: Baker Hughes Incorporated
    Inventors: Michael L. Cognevich, Steven H. Shirk
  • Patent number: 4433828
    Abstract: A quick-acting stud tensioner tool for enabling the loosening or tightening of a stud nut on a reactor vessel stud. The tool engages the vessel stud by closing a gripper mechanism around an upper end of the vessel stud upon a transfer of the mass of the tool from a hoist to a support structure surrounding the vessel stud. After the stud has been elongated, the gripper mechanism releases the vessel stud when the mass of the tool is transferred from the support structure surrounding the vessel stud to the hoist.
    Type: Grant
    Filed: January 29, 1981
    Date of Patent: February 28, 1984
    Assignee: Westinghouse Electric Corp.
    Inventors: Stanley R. Spiegelman, Robert B. Salton, Robert W. Beer, Louis J. Malandra, Michael L. Cognevich
  • Patent number: 4415036
    Abstract: The disclosure relates to a flapper type safety valve incorporating a pressure equalizing feature in the body of the flapper valve. A bypass aperture in the flapper valve communicates with a downwardly facing conical sealing surface. A conically shaped sealing plug is insertable in the bypass aperture and has a post portion projecting upwardly through such aperture. A diametral slot is provided in the top surface of the flapper valve body to mount a leaf spring which is secured to the upstanding post. An abutment element is also secured to the top end of the upstanding post and projects diametrically into the path of the actuating sleeve normally utilized to effect the opening of the flapper valve.
    Type: Grant
    Filed: February 22, 1982
    Date of Patent: November 15, 1983
    Assignee: Baker Oil Tools, Inc.
    Inventors: Michael A. Carmody, Michael L. Cognevich