Manuel Antonio Russo

US Patent:

40268039, May 31, 1977

Filed:

Dec 24, 1975

Appl. No.:

5/644179

Inventors:

Louis Abrahams - Worcester MA
Manuel A. Russo - Framingham MA

Assignee:

Waters Associates - Milford MA

International Classification:

B01D 1508

US Classification:

210198C

Abstract:

Novel end fitting assemblies of particular advantage for use on liquid chromatographic columns, and novel chromatographic columns comprising these novel end fittings. The end-fittings are characterized by (a) very low dead space; (b) economical and convenient replacement of wearing parts; with minimal disturbing of the packed column, or other functional end-fitting components such as cones, filters, etc. A particular advantage is the design whereby the connector portions of the fitting assembly are not normally wetted by process fluids during operation of the column. Thus, the connector portions of the assemblies can be selected from a wide variety of mechanically-desirable materials selected for their wearing characteristics. Moreover, the fittings can be tightened for high-pressure operation without damage to the structure of the column of which they are used.

US Patent:

46550950, Apr 7, 1987

Filed:

Apr 2, 1986

Appl. No.:

6/847282

Inventors:

Manuel A. Russo - Holliston MA
William Richards - Medway MA

Assignee:

Millipore Corporation - Bedford MA

International Classification:

G01N 100

US Classification:

7386483

Abstract:

The invention resides in a compound valve having utility in a sample injector for a liquid chromatograph. The valve has a pair of rotary spool valves (52, 54), each valve has a shaft (60) with an axial bore (64) in one end and a radial bore (66) communicating with the axial bore. A valve seal (70) surrounds the shaft. A pair of radial passageways (77, 78) in the seal are aligned diametrically and lie in a common plane with the radial bore (66) in the valve shaft. A pinion (62) is fixed to each shaft and a common driving gear (68) engages each pinion to rotate both shafts simultaneously through 180. degree. to place the radial bores in the shafts in communication selectively with either radial passageway in the valve seals.