David A Warren

US Patent:

D453797, Feb 19, 2002

Filed:

Apr 5, 2001

Appl. No.:

29/139906

Inventors:

Joyce Cranston - Arvada CO
David Warren - Arvada CO
Evan Cotgageorge - Denver CO

Assignee:

WRS Group, Ltd. - Waco TX

International Classification:

2002

US Classification:

D20 23

US Patent:

6423279, Jul 23, 2002

Filed:

Oct 16, 2000

Appl. No.:

09/687098

Inventors:

David W. Warren - Sun Valley CA

Assignee:

Harvest Energy Technology, Inc. - Sun Valley CA

International Classification:

B01J 804

US Classification:

422191, 422193, 422201, 422211, 422239

Abstract:

A compact endothermic catalytic reaction apparatus for converting hydrocarbon feedstock and methanol to useful gases, such as hydrogen and carbon monoxide, comprising a tubular endothermic catalytic reactor, a radiant combustion chamber and an annular convection section. Thus tubular endothermic catalytic reactor receives radiant energy from a metal fiber burner that is disposed within the radiant combustion chamber. Combustion products from the radiant chamber enter an annular convection section wherein heat is transferred by forced convection to the tubular endothermic catalytic reactor. The combination of radiant and convective heat transfer results in a compact design of high thermal efficiency.

US Patent:

6544406, Apr 8, 2003

Filed:

Dec 8, 1997

Appl. No.:

08/986449

Inventors:

David W. Warren - Sun Valley CA
Michael B. Donahue - Monrovia CA

Assignee:

Harvest Energy Technology Inc. - Sun Valley CA

International Classification:

C10G 916

US Classification:

208 48R, 208 48 AA, 585648

Abstract:

The formation of coke on metal surfaces exposed to hydrocarbons in a thermal cracking process is reduced by ion implantation of selected antifoulants into such metal surfaces; the antifoulants being chosen from a group of primary elements consisting of aluminum, silicon, and chromium, or combinations thereof, and a group of secondary elements consisting of calcium, lithium, potassium, magnesium, cesium, hafnium, yttrium and zirconium, or combinations thereof.

US Patent:

6585785, Jul 1, 2003

Filed:

Oct 27, 2000

Appl. No.:

09/696575

Inventors:

David W. Warren - Van Nuys CA
Michael B. Donahue - La Verne CA

Assignee:

Harvest Energy Technology, Inc. - Sun Valley CA

International Classification:

B01J 800

US Classification:

481279, 48119, 48123, 48113, 48102 A, 422107, 422110, 422111, 422204, 422211

Abstract:

A fuel processor apparatus comprising a catalytic tubular reactor is heated using an infrared radiant burner to provide the endothermic heat of reaction needed to reform a mixture of hydrocarbon and steam for the production of a hydrogen-rich gas stream. The hydrogen-rich gas stream is further purified using a sequence of catalytic steps that is fed to a fuel cell whereupon a portion of the hydrogen contained in the gas stream is consumed for the production of electricity by electrochemical reaction with oxygen. An unused portion of the purified hydrogen-rich gas stream exits the fuel cell stack and is combusted in the infrared radiant burner. A fuel cell control system rapidly responds to a variable fuel cell electric demand by adjusting the feed of hydrocarbon to the catalytic tubular reactor to maintain the surface temperature of the infrared radiant burner within defined limits.

US Patent:

6835360, Dec 28, 2004

Filed:

Oct 15, 2001

Appl. No.:

09/977732

Inventors:

David W. Warren - Sun Valley CA

Assignee:

Harvest Energy Technology, Inc. - Sun Valley CA

International Classification:

B01J 802

US Classification:

422190, 422211, 422198, 422204, 422206, 48 61, 48 62 R

Abstract:

A compact endothermic catalytic reaction apparatus for converting hydrocarbon feedstock and methanol to useful gases, such as hydrogen and carbon monoxide, comprising a tubular endothermic catalytic reactor, a radiant combustion chamber and an annular convection section. Thus tubular endothermic catalytic reactor receives radiant energy from a metal fiber burner that is disposed within the radiant combustion chamber. Combustion products from the radiant chamber enter an annular convection section wherein heat is transferred by forced convection to the tubular endothermic catalytic reactor. The combination of radiant and convective heat transfer results in a compact design of high thermal efficiency.

US Patent:

7074373, Jul 11, 2006

Filed:

Nov 13, 2000

Appl. No.:

09/709616

Inventors:

David W. Warren - Van Nuys CA, US
Michael B. Donahue - La Verne CA, US

Assignee:

Harvest Energy Technology, Inc. - Sun Valley CA

International Classification:

B01J 8/02
C01B 3/48

US Classification:

422198, 422211, 422220, 422200, 423655

Abstract:

A thermally-integrated lower temperature water-gas shift reactor apparatus for converting carbon monoxide in the presence steam comprises a catalyst bed that is disposed within an outer region surrounding a waste heat recovery steam generator operating at a selected pressure corresponding to the optimum temperature for conducting the catalytic water-gas shift reaction and a process for useful recovery of the exothermic heat of reaction to generate steam that is used in a process for the conversion of hydrocarbon feedstock into useful gases such as hydrogen.

US Patent:

7609381, Oct 27, 2009

Filed:

Mar 20, 2008

Appl. No.:

12/052705

Inventors:

David Wheeler Warren - Los Angeles CA, US

Assignee:

The Aerospace Corporation - El Segundo CA

International Classification:

G01J 3/28
G01J 3/18

US Classification:

356328

Abstract:

A spectrometer apparatus includes a refractor element, a slit, a detector, a diffraction grating, and a corrector lens. The refractor element includes a rear surface and a front surface. The slit provides an optical path to the rear surface of the refractor element, and is configured to transmit an image incident thereupon along the optical path. The detector is positioned facing the rear surface of the refractor element. The diffraction grating faces the front surface of the refractor element, and is configured to spectrally disperse and reimage the image of the slit toward the front surface of the refractor element. The corrector lens is positioned between the refractor element and the diffraction grating such that the image is provided to the detector corrected for a spherical aberration caused by a separation distance between the detector and the rear surface of the refractor element.

US Patent:

8304730, Nov 6, 2012

Filed:

Jun 1, 2010

Appl. No.:

12/791604

Inventors:

Nielson Wade Schulenburg - Herndon VA, US
David Wheeler Warren - Los Angeles CA, US
Donald J. Rudy - San Pedro CA, US
Michael G. Martino - Inwood WV, US
Mark Alan Chatelain - Amissville VA, US
Michael Arthur Rocha - Centreville VA, US

Assignee:

The Aerospace Corporation - El Segundo CA

International Classification:

G01J 5/00

US Classification:

2503381

Abstract:

A method for measuring spectral characteristics includes capturing spectral-spatial data that includes radiance measurements over spectrally flat, highly emissive surface portions of a sample material and heater at least two different heater temperatures for transmissive and/or emissive configurations. Temperatures of the sample material and heater are determined at the different heater temperatures for each configuration using, in each instance, radiance measurements taken after the temperatures of the heater and sample material have both stabilized. The transmissivity of the sample material is determined using the temperatures determined in the transmissive configuration and spectral-spatial data collected at selected points of interest over the sample material. The emissivity of the sample material is determined using the temperatures determined in the emissive configuration, the spectral-spatial data collected at selected points of interest over the sample material, and the transmissivity. The reflectivity of the sample material is determined using the emissivity and transmissivity.