Dan Vu Nguyen

6558139, May 6, 2003

Dec 8, 2000

09/733257

Dan Nguyen - Houston TX
Gary Templin - Spring TX
Brannon Baskin - Magnolia TX

Chemical Seal Packing, Inc.

F04B 1700

417420, 41742312, 415229

A self lubricating bearing for use submerged in cryogenic fluids. The self-lubricating bearing comprises hardened races, hardened rolling elements and polymeric retainers or cages. More particularly, the rolling elements may be hardened balls, and the polymeric cages may include PEEK. In particular a bearing for self lubricated use in seal-less, magnetic drive pump for pumping fluids at very low temperatures and cryogenic temperatures below about -100 degrees centigrade such as liquid nitrogen and temperatures below about -150 degrees centigrade such as liquefied natural gas (LNG). An environment for submerged use of such a bearing may be a magnetically driven cryogenic pump with a housing having an intake and exhaust with a back plate mounted therein in which a shaft is journaled in self-lubricating bearings having hardened stainless steel or ceramic balls, stainless steel races and polymeric retainers or cages for retaining the balls for rolling contact in the races. An impeller is mounted on the first end and a first magnet is mounted on the second end of the shaft.

58105700, Sep 22, 1998

Jan 6, 1997

8/778952

Dan Dinh Nguyen - Houston TX

Chemical Seal & Packing, Inc. - Houston TX

F04B 3908

417505

A novel reciprocating pump for cryogenic fluids having a super-low NPSH requirement. The pump has a spring-loaded intake valve made of magnetic material and a reciprocating piston having a permanent magnet at its head end. The intake valve is positioned such that when the piston is at or near the top of its stroke, the magnet will tend to pull said intake valve into an open position. The pump also preferably includes a mechanical spring energized (MSE) seal on the upper end of the piston.

60565209, May 2, 2000

Jul 6, 1998

9/110584

Dan Dinh Nguyen - Houston TX
Gary A. Templin - Houston TX

Chemical Seal & Packing, Inc. - Houston TX

F04B 1700

417420

A seal-less, magnetic drive pump for pumping fluids at very low temperatures such as liquid nitrogen and liquefied natural gas (LNG). The pump includes a housing having an intake and exhaust with a back plate mounted therein in which a shaft is journaled. An impeller is mounted on the first end and a first magnet is mounted on the second end of the shaft. A second magnet is positioned so as to rotate around the first magnet to rotate the impeller. The first magnet is encased in a material having a coefficient of thermal expansion greater than that of the magnetic material.

61832197, Feb 6, 2001

Jul 6, 1998

9/110581

Dan Dinh Nguyen - Houston TX
Gary A. Templin - Houston TX

Chemical Seal & Packing, Inc. - Houston TX

F04B 3504

417420

A seal-less, magnetic drive pump for pumping fluids at very low temperatures below about -100 degrees centigrade such as liquid nitrogen and at cryogenic temperatures below about -150 degrees centigrade such as liquefied natural gas (LNG). The pump includes a housing having an intake and exhaust with a back plate mounted therein in which a shaft is journaled in self-lubricating ball bearings having metallic balls and races and having polymeric ball retainers. An impeller is mounted on the first end and a first magnet is mounted on the second end of the shaft. A second magnet is positioned so as to rotate around the first magnet to rotate the impeller. The first magnet is encased in a material having a coefficient of thermal expansion greater than that of the magnetic material.

59964723, Dec 7, 1999

Oct 7, 1996

8/726649

Dan Dinh Nguyen - Houston TX
Donald Craig Tooms - Houston TX

Chemical Seal and Packing, Inc. - Houston TX

F16J 900

92245

A novel reciprocating pump for cryogenic fluids. The pump has a cylinder sleeve, head, intake valve, discharge valve, and a reciprocating piston including a mechanical spring energized seal having a generally U-shaped jacket and a helical spring in the bight of the U.