Michael Patrick Calhoun

US Patent:

6957908, Oct 25, 2005

Filed:

Sep 15, 2001

Appl. No.:

09/954677

Inventors:

William J. O'Connell - Frisco TX, US
Michael B. Calhoun - Carrollton TX, US
Jack Harowitz - Mesa AZ, US

Assignee:

Oshkosh Truck Corporation - Oshkosh WI

International Classification:

B28C005/42
B28C007/14

US Classification:

366 41, 366 54

Abstract:

An environmental shield for reducing or eliminating leakage of materials from transit vehicles, including truck-mounted concrete mixers, is provided. The environmental shield preferably engages at least a portion of an opening on a mixer drum such that the leakage that generally occurs in such situations as travel along hilly or bumpy terrain, surging, etc. may be prevented or minimized. The environmental shield preferably includes a discharge cover and a combination steel/rubber abrasion resistant sealing member and may be preferably coupled to a charging hopper of the transit vehicle.

US Patent:

42769370, Jul 7, 1981

Filed:

Feb 7, 1979

Appl. No.:

6/009869

Inventors:

Michael B. Calhoun - Carrollton TX
Russell I. Bayh - Carrollton TX
Robert E. Dutton - Aurora CO

Assignee:

Otis Engineering Corporation - Dallas TX

International Classification:

E21B 4312

US Classification:

166323

Abstract:

A well safety system for controlling the flow of fluid through well conduits. The system includes a surface controlled subsurface safety valve made up as part of a tubing string extending from the well surface to a subsurface formation within a casing string. A packer, installed below the safety valve, forms a fluid tight seal between the tubing and casing to direct fluid from below the packer into the tubing. The safety valve contains lateral passageways which allow communication of fluid from the bore of the safety valve to the annulus between the tubing and casing above the packer. A valve actuator is releasably secured within the upper portion of the safety valve and forms a fluid tight seal between control fluid pressure in the tubing string above the safety valve and formation fluid pressure in the tubing string below the safety valve. The safety valve can be locked open when control pressure is increased above a preselected value and then released. The safety valve can be unlocked by returning control pressure to another preselected value.

US Patent:

41604784, Jul 10, 1979

Filed:

May 10, 1978

Appl. No.:

5/904431

Inventors:

Michael B. Calhoun - Carrollton TX
John V. Fredd - Dallas TX

Assignee:

Otis Engineering Corporation - Dallas TX

International Classification:

E21B 2900

US Classification:

166 551

Abstract:

A well tool for inclusion in a tubing string of a well adapted to perform multiple functions including controlling fluid flow through the tubing string and/or cutting coiled tubing or wire line used in the tubing string for performing well completion and workover functions. The tool includes a tubular body connectible in a tubing string and having a flow passage therethrough, a spherical seat surface around the flow passage developed on an eccentrically positioned center relative to the axis of the flow passage, an operator member which may function as a cutter, a valve, or a combination cutter and valve having a spherical surface engageable with the seat surface and mounted on an axis of rotation eccentrically positioned relative to the axis of the flow passage and coincident with the center of the spherical seat surface, an actuator movable longitudinally in the housing and engageable with a surface of the operator member spaced from the axis of rotation of the operator member to rotate the operator member from a first opened position to a second closed position, and return apparatus for rotating the operator member back from the second closed to the first opened position. An annular hydraulically operable piston is provided in the housing to move the actuator. The operator member is a spherical segment formed on a radius which is larger than the radius of the bore through the housing so that by pivoting the operator member eccentrically within the housing maximum torque is generated in the operator member by application of force at a substantial distance from the axis of rotation of the member by the actuator.

US Patent:

43545548, Oct 19, 1982

Filed:

Apr 21, 1980

Appl. No.:

6/142096

Inventors:

Michael B. Calhoun - Carrollton TX
Robert L. Holland - Ventura CA
Paul D. Scott - Carrollton TX

Assignee:

Otis Engineering Corporation - Dallas TX

International Classification:

E21B 3410
E21B 3416
E21B 4312

US Classification:

166321

Abstract:

A wire line removable well safety valve in an oil and gas well completion design including a tubing string, a well packer around the tubing string sealing with the well casing, and a submergible well pump on the tubing string below the packer. The safety valve controls flow of pumped well fluids through the tubing string, directs separated gas into the casing annulus around the tubing string above the packer, and shuts off the flow of pumped fluids and separated gas to the surface while permitting recirculation of pumped well fluids between the annulus and tubing string below the packer. The safety valve includes a housing having separate central and annular flow passages for pumped fluids and separated gas, respectively, a ball valve for controlling flow of pumped fluids in the central flow passage, an annular bypass valve for controlling flow of separated gas along the annular flow passage, and a recirculating valve between the central and annular flow passages for recirculation of pumped fluids when the ball and bypass valves are closed. The safety valve is held open hydraulically from the surface and includes means for closing the valve when hydraulic pressure fails, shutting off the flow of pumped fluids and bypass gas while permitting continuous operation of the well pump by recirculating pumped fluids below the packer.