James D Weiler

US Patent:

59242914, Jul 20, 1999

Filed:

Oct 20, 1997

Appl. No.:

8/953963

Inventors:

James Michael Weiler - Shakopee MN
Thomas Karl Drube - Lakeville MN
Audrey Duane Preston - New Prague MN

Assignee:

MVE, Inc. - New Prague MN

International Classification:

F17C 902

US Classification:

62 502

Abstract:

A system delivers cryogenic gas at a high pressure from a supply of cryogenic liquid maintained at a low pressure in a bulk tank. The bulk tank supplies liquid to at least one transfer tank. The transfer tank is pressurized by connecting it to a pressure building tank contaning gas at a high pressure. A heat exchanger is connected in circuit between the transfer tank and the pressure building tank. The transfer tank provides liquid at a high pressure to the heat exchanger so that a vapor is produced. This vapor is fed to the pressure building tank so that the high pressure therein is maintained. The transfer tank provides a high pressure flow of liquid to a vaporizer and a high pressure gas storage tank so that high pressure cryogenic gas may be produced and stored.

US Patent:

59376554, Aug 17, 1999

Filed:

Dec 4, 1997

Appl. No.:

8/984743

Inventors:

James M. Weiler - Shakopee MN
Ryan A. Erickson - Farmington MN
Scott Darrell Isebrand - Minneapolis MN
Audrey Duane Preston - New Prague MN

Assignee:

MVE, Inc. - New Prague MN

International Classification:

F17C 702

US Classification:

62 501

Abstract:

A device for pressurizing a tank containing a supply of cryogenic liquid features a tubular enclosure disposed within the cryogenic liquid. The tubular enclosure features an opening in its bottom and is in communication with a pressure builder coil external to the tank. The vapor side of the pressure builder coil is in communication with the head space of the tank. An electric heater element is disposed in the bottom of the tubular enclosure. An insulating tube may optionally be disposed about the tubular enclosure. In addition, a ball may optionally be positioned adjacent the opening in the tubular enclosure so that a check valve is formed. The device fits through the tops of existing cryogenic tanks.