Thomas W Welch

US Patent:

6932850, Aug 23, 2005

Filed:

Jun 29, 1999

Appl. No.:

09/720197

Inventors:

Thomas C. Welch - Homer NY, US
Joseph Verschneider - Cortland NY, US
John D. Miller - Sunnyside NY, US

Assignee:

Pall Corporation - East Hills NY

International Classification:

B01D027/06

US Classification:

55521, 55DIG 5, 96 67, 264286, 264287, 264DIG 48

Abstract:

A filter may comprise a plurality of pleats, at least one pleat including a pair of pleat legs and pleat tip region. In some embodiments, a thickness of pleat tip region at a point spaced about one to four pleat leg thicknesses from the end of the pleat tip region may be less than or equal to about twice the pleat leg thickness or may be less than or equal to a distance between corresponding points on opposing outer surfaces of the pleat legs. A filter may comprise a pleated structure having a plurality of pleats. In some embodiments, the pleated structure may have more than one layer and at least one of the pleats may have a reformed pleat tip region. In other embodiments, the pleated structure may have a pair of pleat legs and at least one of the pleats may have a reformed pleat tip region and contacting pleat legs. A filter may comprise a plurality of pleats, at least one pleat including a pleat tip region having contacting inner surfaces. A method of making a filter may comprise forming a plurality of pleats having pleat tip regions and applying pressure to opposing outer surfaces of at least one pleat tip region.

US Patent:

54437245, Aug 22, 1995

Filed:

Mar 29, 1993

Appl. No.:

8/038231

Inventors:

Kenneth M. Williamson - Jamesville NY
Scott A. Whitney - Marathon NY
Alan R. Rausch - Cortland NY
Thomas C. Welch - Homer NY

Assignee:

Pall Corporation - East Hills NY

International Classification:

B01D 3600
B01D 3602

US Classification:

2103232

Abstract:

A liquid purification system is provided which is capable of separating a first liquid, that is wholly or partly immiscible in and forms a discontinuous phase with a second, continuous phase-forming liquid, from the second liquid, which includes at least one coalescing element or assembly for coalescing the first liquid having at least one fluid inlet at the top thereof; and at least one separating element or assembly for separating droplets of the first liquid from the second liquid, the at least one coalescing element or assembly being arranged in superposed and fluid communicable relationship above the at least one separating element or assembly.

US Patent:

50387758, Aug 13, 1991

Filed:

Jan 4, 1988

Appl. No.:

7/140677

Inventors:

John Maruscak - Athens, CA
Pierre Legare - Brockville, CA
Thomas C. Welch - Homer NY

Assignee:

Her Majesty the Queen in right of Canada as represented by the Minister
of National Defence of Canadian Government

International Classification:

A62B 710

US Classification:

12820527

Abstract:

The invention disclosed is an improved scrim means for use in a breathing gas filter assembly which includes a pleated web filter medium. The improved scrim means is of a non-woven microorganism resistant synthetic polymeric material of sufficient rigidity to provide substantially continuous support to maintain the pleats of the filter medium in substantially uniformly spaced relationship, to expedite fluid flow in the plane of the web and to minimize nesting of the filter medium.