Vincent P Fresch, Age 92PO Box 672, Elm Grove, WI 53122

7000332, Feb 21, 2006

Apr 6, 2005

11/100165

Vincent P Fresch - Elm Grove WI, US
Titus A. Mathews - Kenosha WI, US

Pneumatech, Inc. - Kenosha WI

F26B 3/00

34330, 34343, 34473, 95 98, 95122, 95123

A gas drying apparatus is provided having at least two desiccant-containing towers which alternately receive moisture-saturated air from an inlet to be dried during a drying phase, and then receive dry air during a regeneration phase to regenerate the desiccant which had previously adsorbed moisture from saturated air during the drying phase. The apparatus diverts a portion of dry air flowing along one of two flow paths including a first flow path having a heater and a pulse purge regeneration control valve for selectively enabling delivery of heated dry air to the tower being regenerated, and a second flow path which bypasses the first flow path and includes a bypass valve for selectively permitting delivery of unheated dry air to the tower being generated so as to cool the desiccant therein. A temperature sensing arrangement is provided for monitoring and maintaining the internal temperature of heated dry air delivered into the tower being regenerated.

7279026, Oct 9, 2007

Apr 8, 2005

11/102376

Vincent P. Fresch - Elm Grove WI, US
Titus A. Mathews - Pleasant Prairie WI, US

Pneumatech LLC - Kenosha WI

B01D 53/04
B01D 53/26

95124, 96126

A heat of compression gas drying apparatus includes an air inlet fed by a source of compressed moisture laden air, an air outlet and first and second desiccant-containing towers for processing air flowing therethrough. A portion of cooled dried air delivered to the air outlet is selectively diverted to either a pathway having a heater so that heated dried air may be delivered to a tower having its desiccant regenerated, or to a separate pathway so that cooled dried air is delivered to the regenerating tower. In each case, a purge isolation valve is controlled to deliver and hold pressurized dried air in the regenerating tower after which the dried air in the regenerating tower is purged to atmosphere by pulsing an exhaust valve arrangement connected to the regenerating tower.

4738692, Apr 19, 1988

May 26, 1987

7/057700

Vincent P. Fresch - Elm Grove WI
Mashud A. Awad - Racine WI
Anthony R. Rossi - Brookfield WI

B01D 5304

55 26

A twin tower gas drying apparatus in which the towers alternately receive moisture saturated air to be dried and then receive dry air to regenerate the desiccant which had previously adsorbed moisture from the saturated air includes purge valves which release the air used for regeneration of the desiccant into the atmosphere and controls for the purge valves that alternately open and close the purge valve during regeneration so that the tower being regenerated is alternately pressurized and depressurized during regeneration so that the amount of air released through the purge valve is limited without causing a dew point elevation of the dry air.

4918939, Apr 24, 1990

Jan 10, 1989

7/295482

Vincent P. Fresch - Elm Grove WI
Titus Mathews - Kenosha WI
Anthony R. Rossi - Brookfield WI

Pneumatech, Inc. - Kenosha WI

F25D 2100

62272

An improved self-contained air drying unit utilizes a single fan to draw air across an aftercooler, a condenser and a reheater, all of which are located within a single housing.