John H Cheung

US Patent:

40747794, Feb 21, 1978

Filed:

May 9, 1977

Appl. No.:

5/794898

Inventors:

John B. Cheung - Kent WA
Earll M. Murman - Kent WA

Assignee:

The United States of America as represented by the Secretary of the
Interior - Washington DC

International Classification:

E21B 3900
E21B 2100

US Classification:

175314

Abstract:

A hydraulic borehole mining device is provided of the type wherein a pair of high pressure water jets located along the length of the device are used to cut the mineral to be mined and a slurry pick-up system used to transport the particles cut away by the jets back to the ground surface. The slurry pick-up may include a slurry jet pump which is also supplied with water under pressure. The jet pump includes a jet nozzle which is directed so as to draw particles through screens that cover inlets for the particles located about the circumference of the device, and which thus entrains the particles in a slurry with the water, this slurry of water and mineral particles being pumped back to the surface. To prevent clogging or blocking of the screens such as can occur when particles accumulate thereon, a backflush or backwash valve is provided which, when actuated, blocks and deflects the water from the jet nozzle and thus causes the water flow to reverse itself and pass out through the screens to thereby provide cleaning of the screens.

US Patent:

40812006, Mar 28, 1978

Filed:

Dec 10, 1976

Appl. No.:

5/749215

Inventors:

John B. Cheung - Bellevue WA

Assignee:

Flow Industries, Inc. - Kent WA

International Classification:

E01C 2309
E21C 3706

US Classification:

299 17

Abstract:

By the action of water jetted against the concrete in systematically controlled manner under ultra-high pressures (i. e. above 25,000 psi) areas of structural concrete are removed to required depths through the one or more levels of aggregate involved efficiently and with safety to the basic structure and to attendant personnel. With this method and apparatus employing an array of such jets scanned progressively back and forth over a work area, the rates at which requisite volumes of hardened concrete can be removed, regardless of condition or state of the concrete and the presence of reinforcing bars, are much greater than those customarily achieved with conventional methods. Moreover the operation can be performed without danger of cutting into and weakening embedded reinforcing bars, without damaging the concrete in adjoining regions, without dust pollution and with minimum noise levels that are also readily shieldable. The sequential penetrating and exploding action of the ultra-high pressure water entering between and beneath the aggregate particles not only removes the concrete immediately surrounding embedded reinforcing bars but is also effective to remove surface scale and corrosion from such bars, conditioning them to form a strong bond with fresh concrete to be poured around them. Moreover, incidence angle of the water jets to the concrete surface may be varied during scan so as to enhance the removal action in places otherwise difficult to reach, such as beneath and behind reinforcing bars or composites of such bars.

US Patent:

43066275, Dec 22, 1981

Filed:

Feb 21, 1979

Appl. No.:

6/013884

Inventors:

John B. Cheung - Bellevue WA
Scott D. Veenhuizen - Kent WA

Assignee:

Flow Industries, Inc. - Kent WA

International Classification:

E21B 1060

US Classification:

175422

Abstract:

A fluid jet drilling nozzle and associated drilling method. The nozzle is adapted to be connected to a source of high pressure fluid and to be rotated about a rotation axis, and comprises a body formed so that it partially encloses a cavity, which cavity is in fluid communication with the source of high pressure fluid when the nozzle is connected to such source. The nozzle further comprises means for allowing high pressure fluid in the cavity to exit the nozzle in the form of a high velocity fluid jet which intersects the axis of rotation of the nozzle. Such a nozzle may be mounted in any drilling apparatus capable of supplying high pressure fluid to the cavity and of rotating or oscillating the nozzle about its rotation axis.

Address:

3017 16 Ave S, Seattle, WA 98144

VIN:

JF2SHADCXBH734629

Make:

SUBARU

Model:

FORESTER

Year:

2011