David B Rowley
Medical Practice in Salt Lake City, UT

5512025, Apr 30, 1996

Jul 2, 1991

7/724732

William T. Dalebout - Logan UT
Donald J. Standing - Logan UT
Scott R. Watterson - River Heights UT
Dane P. Brewer - Salt Lake City UT
Lee Robertson - Sandy UT
David R. Rowley - Kearns UT

ICON Health & Fitness, Inc. - Logan UT

A63B 21005

482 6

A control console for exercise machines such as treadmills having a microprocessor to generate signals to control the exercise. The console is operable to control an exercise program comprising a series of time segments for which the difficulty levels are individually specified, and to provide a display of the program time segments. The console is further operable to display and store user-designed programs of the type described. Optionally, the console is operable to control two difficulty parameters of an exercise machine. The console may also include preset programs selectable by a user. The preset programs may include a fitness test comprising a series of exercise time segments of increasing difficulty, in which a user's fitness level is based on the user's inability to continue exercising beyond a particular time segment.

4234048, Nov 18, 1980

Jun 12, 1978

5/914449

David S. Rowley - Salt Lake City UT

Christensen, Inc. - Salt Lake City UT

E21B 1046

175329

A diamond drill bit for drilling bore holes in earth formations having a body connectible to a drilling string, and provided with a matrix portion of hard metals in which diamonds are surface set at the outer gage portion and adjacent to the bit axis, the hard metal matrix having preformed grooves in which preformed diamond impregnated segments are inserted, which are a mixture of diamonds and hard metals, and secured to the matrix portion by brazing material. During bit rotation in the bore hole, the segments cut the major portion of the hole, the diamonds being dispersed throughout the mass of each segment for selective release from the segment as the diamonds become damaged and lost, thereby exposing new diamonds in the segment at a controlled rate, and thereby producing continual resharpening of the segments. As a result, the drilling rate of the bit is increased, as well as the length of hole drilled.

4512419, Apr 23, 1985

Sep 9, 1983

6/530784

David S. Rowley - Salt Lake City UT
James T. Aumann - Salt Lake City UT

Christensen, Inc. - Salt Lake City UT

E21B 2506

175 58

An improved coring device that incorporates a nonrotatable inner barrel disposed within the outer driving structure of the drill string which is coupled to a coring bit. A woven metal mesh sleeve is circumferentially mounted outside the inner barrel and tucked around its lower end. The lower end of the mesh sleeve in the inner barrel is in turn connected to a stripper tube which is pulled upwardly during the coring operation. As the core is cut by the coring bit and enters the inner barrel, the woven metal mesh sleeve is disposed about the core and constricts about the core when pulled upwardly by the stripper tube. The opposing end of the woven metal mesh sleeve is connected to a weight which serves to compress the metal sleeve when outside the inner barrel, thereby increasing its diameter to prevent binding or jamming.

4278138, Jul 14, 1981

Jan 21, 1980

6/113497

David S. Rowley - Salt Lake City UT
James T. Aumann - Salt Lake City UT
Lothar H. Waldes - Salt Lake City UT

Christensen, Inc. - Salt Lake City UT

E21B 1716, F16L 914

175320

A composite drill collar for drilling bore holes in earth formations including a structural steel outer jacket having a lower end secured to a lower coupling connectable to a drill bit and an upper end secured to an upper coupling connectable to an adjacent drill collar thereabove. An annular heavy metal core of sintered tungsten is disposed in the jacket and is held in compression therein by preloading the lower and upper couplings against the ends of the core, which places the jacket in tension, causing the jacket to contract and grip the periphery of the core. The structural steel jacket has a thick wall to carry the bending, torsion, compression, tension and impact loads encountered in the drilling operation, so that such loads are not carried through the core, which has the purpose of increasing the overall density and mass of the composite drill collar, lessening considerably the tendency for a deviated well bore to be produced.

5789827, Aug 4, 1998

Oct 9, 1996

8/728807

David R. Rowley - Kearns UT
Cesar A. Montano - Pleasant Grove UT
Gordon B. Langford - Sandy UT

Sensitron, Inc. - Midvale UT

B60R 2120

307 91

A system selectively completes a horn circuit through which electrical power is provided to a horn in an automobile. A relay is connected to a power supply and completes the horn circuit when a current signal passing through the relay has at least a threshold magnitude. A relay driver is selectively activated by processing circuitry. When it is activated, the relay driver is in a conductive state, and when it is not activated, the relay driver is in a high impendance state. When the relay driver is in the conductive state, it places the relay in series with a low potential conductor thereby establishing the current signal at at least the threshold magnitude. The processing circuitry is electrically connected to a manually actuated sensor, which may be a flexible potentiometer. The processing circuitry activates the relay driver when the manually actuated sensor is actuated. The processing circuitry receives electrical power from the relay when the relay driver is in the high impendance state, but receives essentially no electrical power from the relay when the relay driver is in the conductive state.

4073354, Feb 14, 1978

Nov 26, 1976

5/745087

David S. Rowley - Salt Lake City UT
Bruce H. Walker - Salt Lake City UT
Coy M. Fielder - Granger UT
Heino J. Rohde - Nienhagen, DT

Christensen, Inc. - Salt Lake City UT

E21B 936, E21B 1301

175329

The invention relates to the design of earth boring bits employing shaped preform cutters containing hard abrasive materials such as diamonds.

4244432, Jan 13, 1981

Jun 8, 1978

5/913571

David S. Rowley - Salt Lake City UT
Bruce H. Walker - Salt Lake City UT
Coy M. Fielder - Granger UT

Christensen, Inc. - Salt Lake City UT

E21B 936, E21C 1301

175329

The invention relates to the design of earth bore-hole drill bits employing shaped preform cutters containing hard abrasive materials, such as diamonds, the cutters being mounted in companion preformed sockets in a hard metal bit matrix.