John P Howell

Address:

5353 Memorial Dr UNIT 2045, Houston, TX 77007

Phone:

(713)3393379

VIN:

1GKFC13J67J316118

Make:

GMC

Model:

YUKON

Year:

2007

Address:

2675 Helm Rd, Burton, TX 77835

VIN:

1FTRW12W37KB48624

Make:

FORD

Model:

F150

Year:

2007

US Patent:

20040042512, Mar 4, 2004

Filed:

Aug 27, 2002

Appl. No.:

10/228285

Inventors:

Antia Lamas-Linares - Oxford, GB
John Howell - New York NY, US
Dik Bouwmeester - Oxford, GB

International Classification:

H01S003/10

US Classification:

372/021000

Abstract:

A method and apparatus for enhancing the production of polarisation-entangled multiphoton states from a laser pumped parametric down-converting crystal. The pump beam and initial down-converted photons are returned by retro mirrors, in phase to the down-converting crystal where they stimulate the emission of further polarisation-entangled states. The efficiency of the process is increased by including in the path of the returning down-converted photons a crystal of the same substance and thickness as the down-converting crystal to provide spatial and temporal walk-off compensation. Further, the phase of the returning pump beam is adjusted and optimised by control of the retro-mirror while monitoring the rate of production of polarisation-entangled photon pairs. Maximising the rate of production of photon pairs also maximises the rate of production of higher-order states, such as four-photon states.

US Patent:

51602547, Nov 3, 1992

Filed:

Oct 4, 1991

Appl. No.:

7/771660

Inventors:

Ronald D. Bell - Austin TX
William C. Gardiner - Austin TX
John R. Howell - Austin TX
Ronald D. Matthews - Austin TX
Steven P. Nichols - Austin TX

Assignee:

Radian Corporation and the Board of Regents - Austin TX
The University of Texas System - Austin TX

International Classification:

F23D 1416

US Classification:

431 7

Abstract:

Apparatus for controlled low NO. sub. x combustion. First and second combustion zones are provided, each filled with a porous high temperature resistant matrix, the void spaces of which provide sites at which substantially all of the combustion occurs. The second zone is downstream of the first zone. Means are provided for mixing fuel and a gaseous source of oxygen and providing the resultant combustible mixture to the input end of the first combustion zone to establish fuel-lean conditions therein; and means for feeding the combustion products from the first zone to the second zone and augmenting same with further oxygen and sufficient additional fuel to create fuel-rich burning conditions therein to complete the oxidation of the products from the first zone. Cooling means are preferably mounted in proximity to the input end of the first combustion zone, for maintaining the temperature of the said combustible mixture at the input end below ignition temperature, thereby limiting the flame produced by combustion in the porous matrix to the downstream side of the cooling means. The corresponding method is also disclosed and claimed.

US Patent:

51414325, Aug 25, 1992

Filed:

Mar 15, 1991

Appl. No.:

7/670286

Inventors:

Ronald D. Bell - Austin TX
William C. Gardiner - Austin TX
John R. Howell - Austin TX
Mark M. Koeroghlian - Austin TX
Ronald D. Matthews - Austin TX
Steven P. Nichols - Austin TX

Assignee:

Radian Corporation - Austin TX
The Board of Regents, The University of Texas System - Austin TX

International Classification:

F23D 340

US Classification:

431 7

Abstract:

Burner apparatus for use in controlled low NO. sub. x combustion. Mixing and flow-directing means receive and mix fuel and air provided thereto and form a flow of the resulting combustible mixture. A combustion zone defined by a porous high temperature-resistant matrix includes an input end for receiving the combustible flow. Cooling means are mounted in proximity to the input end of the combustion zone, for maintaining the temperature of the flowing combustible mixture proximate the input end below ignition temperature, thereby limiting the flame produced by combustion in the porous matrix to the downstream side of the cooling means. The method for controlled low NO. sub. x combustion is also disclosed and claimed.

US Patent:

49844342, Jan 15, 1991

Filed:

May 3, 1990

Appl. No.:

7/518740

Inventors:

John L. Peterson - Round Rock TX
John R. Howell - Austin TX

International Classification:

F25B 1700

US Classification:

62 94

Abstract:

A hybrid air conditioning system which simultaneously dehumidifies and cools air using standard vapor-compression equipment and aqueous solutions of liquid desiccant. By using a circulating liquid desiccant and an adiabatic humidifier, a more efficient refrigerant cycle is utilized. Moreover, conditioned air can be delivered at the same temperature and absolute humidity as conventional vapor-compression systems but without overworking the compressor.

US Patent:

50805770, Jan 14, 1992

Filed:

May 24, 1991

Appl. No.:

7/708090

Inventors:

Ronald D. Bell - Austin TX
William C. Gardiner - Austin TX
John R. Howell - Austin TX
Ronald D. Matthews - Austin TX
Steven P. Nichols - Austin TX

International Classification:

F23D 340

US Classification:

431 7

Abstract:

Low NO. sub. x combustion is effected by a method wherein a fuel, e. g. , natural gas, and a source of oxygen, e. g. , air, are mixed and the mixture is combusted in at least two successive combustion zones filled with a porous matrix, the void spaces of which provide sites at which substantially all of the said combustion occurs; viz. a first zone wherein the mixture is fuel-rich, and a second zone wherein the mixture is fuel-lean. Preferably, the method utilizes an additional combustion zone which precedes or is upstream of the first zone and is filled with a said porous matrix, wherein the mixture is fuel-lean. Apparatus for low NO. sub. x combustion is also provided which includes an arrangement for mixing fuel and oxygen, and at least first and second combustion zones filled with a said porous matrix, and means for providing a fuel-oxygen mixture to said first zone which is fuel rich, and for adjusting the resulting combustion products flowed to the second zone with additional fuel and oxygen as to provide a fuel-lean mixture therein. Preferably the apparatus also includes a zone or stage filled with a said porous matrix which precedes or is upstream of the first zone, to which the fuel and oxygen are initially provided as to establish fuel-lean conditions therein.

US Patent:

49413244, Jul 17, 1990

Filed:

Sep 12, 1989

Appl. No.:

7/405624

Inventors:

John L. Peterson - Round Rock TX
John R. Howell - Austin TX

International Classification:

F25B 1700

US Classification:

62 94

Abstract:

A hybrid air conditioning system which simultaneously dehumidifies and cools air using standard vapor-compression equipment and aqueous solutions of liquid desiccant. By using a circulating liquid desiccant and an adiabatic humidifier, a more efficient refrigerant cycle is utilized. Moreover, conditioned air can be delivered at the same temperature and absolute humidity as conventional vapor-compression systems but without overworking the compressor.

US Patent:

43733476, Feb 15, 1983

Filed:

Apr 2, 1981

Appl. No.:

6/250319

Inventors:

John R. Howell - Austin TX
C. S. Patrick Peng - Houston TX

Assignee:

Board of Regents, University of Texas System - Austin TX

International Classification:

F25B 1500

US Classification:

62112

Abstract:

A hybrid double absorption air cooling system employing a liquid desiccant solution and capable of operating at low heat source temperature between 55. degree. C. and 80. degree. C. is provided. In one embodiment the system which utilizes low-grade thermal energy, includes an open absorber employing a liquid desiccant solution for absorbing moisture from air passing therethrough, a cooling coil adapted for cooling air passing through the open absorber, and a vapor-absorption refrigeration system which employs the liquid desiccant solution as an evaporable refrigerant and is adapted for cooling and circulating a working fluid, such as water, through the cooling coil and for circulating the desiccant solution through the open absorber. In an alternate embodiment, an open evaporator is adapted for providing cooling water to the open absorber.