David Dung Le

US Patent:

61743526, Jan 16, 2001

Filed:

Nov 24, 1998

Appl. No.:

9/198471

Inventors:

Roy V. Semerdjian - Sacramento CA
David A. Le Febre - Camino CA

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01D 1508
B01D 7104

US Classification:

96 8

Abstract:

A multi-passage capillary arrangement can be formed from ductile glass material into an assembly that has an essentially round outer cross section and multiple capillary passages with diameters of 250 micrometers or less. The multiple capillary assembly provides multiple capillary sized passages of a regularly recurring shape in a single cohesive bundle. The round outer cross section facilitates the use of the multiple capillary by providing a suitable surface for connections. The multiple capillary arrangement can be made by a method that provides uniform or nearly uniform capillary passages throughout the arrangement. The capillaries are useful for chromatograph applications and as flow restrictors.

US Patent:

59805994, Nov 9, 1999

Filed:

Mar 27, 1998

Appl. No.:

9/049572

Inventors:

Timothy Chris - Folsom CA
David A. Le Febre - Camino CA

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01D 4642

US Classification:

55312

Abstract:

A displaceable purifier body improves the delivery of high purity gases from gas tanks or cylinders by providing a large flow area for filling the cylinder or tank with gas while preventing contamination of gases during the filling procedure and by automatically engaging the purifier for purification when withdrawing gas from the tank or cylinder. The purifier body or a separate seal body has an arrangement for reciprocal movement between a filling position wherein the gas entering the cylinder by-passes the purifier body and an engaged position wherein the purifier body moves towards the cylinder head assembly to prevent by-passing of exiting gases around the purifier. This arrangement offers little restriction to gas flow entering the cylinder and allows rapid filling of cylinders to make gas delivery more economical. The arrangement can also provide an indicator showing positive engagement of the purification system during gas withdrawal and a simple method for manually disengaging the purifier to allow exiting gas to bypass the purifier when desired.