Christopher T Holt

6985082, Jan 10, 2006

Jul 12, 2001

09/903916

Prabir K. Dutta - Worthington OH, US
Scott L. Swartz - Columbus OH, US
Christopher T. Holt - Columbus OH, US
Ramachandra Rao Revur - Columbus OH, US

The Ohio State University Reasearch Foundation - Columbus OH
NexTech Materials, Ltd. - Worthington OH

G08B 17/11

340632, 340633

A sensor and method of use for detection of low levels of carbon monoxide in gas mixtures. The approach is based on the change in an electrical property (for example: resistance) that occurs when carbon monoxide is selectively absorbed by a film of copper chloride (or other metal halides). The electrical property change occurs rapidly with both increasing and decreasing CO contents, varies with the amount of CO from the gas stream, and is insensitive to the presence of hydrogen. To make a sensor using this approach, the metal halide film will deposited onto an alumina substrate with electrodes. The sensor may be maintained at the optimum temperature with a thick film platinum heater deposited onto the opposite face of the substrate. When the sensor is operating at an appropriate (and constant) temperature, the magnitude of the electrical property measured between the interdigital electrodes will provide a measure of the carbon monoxide content of the gas.

20080006531, Jan 10, 2008

Dec 12, 2006

11/637624

Christopher Holt - Columbus OH, US

G01N 27/333

204419000, 205786500, 029592100

A sensor capable of monitoring hydrogen sulfide in a hydrogen-containing background. The sensor comprises novel sulfur sensitive materials that may be deposited as a thin film or thick film in a chemi-resistor format. The novel sulfur sensitive materials may comprise a single component oxide material or a composite of two or more oxide materials. The sensors respond reversibly to HS in a reducing gas environment, with a corresponding change in their electrical resistance that can be used to quantify the amount of HS present in the reducing gas.

20090090626, Apr 9, 2009

Oct 12, 2007

11/974520

Christopher T. Holt - Columbus OH, US
Stephen R. Cummings - Columbus OH, US
Scott L. Swartz - Columbus OH, US
Lora B. Thrun - Columbus OH, US

G01N 27/26
C01F 17/00

204431, 423263, 436 2

A hydrogen sensitive composite sensing material based on cerium oxide with or without additives to enhance sensitivity to hydrogen, reduce cross-sensitivities to interfering gases, or lower the operating temperature of the sensor, and a device incorporating these hydrogen sensitive composite materials including a support, electrodes applied to the support, and a coating of hydrogen sensitive composite material applied over the electroded surface. The sensor may have in integral heater. The sensor may have a tubular geometry with the heater being inserted within the tube. A gas sensor device may include a support, electrodes applied to the support, and a dual sensor element to cancel unwanted effects on baseline resistance such as those resulting from atmospheric temperature changes. The hydrogen sensitive composite material or other gas sensitive materials may be used in the dual element gas sensor device.

20130087071, Apr 11, 2013

Oct 10, 2012

13/648660

Paul H. Matter - Columbus OH, US
Christopher T. Holt - Bexley OH, US
Michael G. Beachy - Gahanna OH, US

C01B 21/064
C09D 101/02
B01F 3/12
C09D 1/00
B82Y 30/00
B82Y 40/00

10620401, 423290, 366342, 1062873, 977891, 977773

A method of forming boron nitride nanoparticles. A plurality of precursor molecules comprising boron, nitrogen and hydrogen may be decomposed in a first heating zone to form a plurality of gaseous molecules that contain bonded boron and nitrogen, followed by heating to a second, higher temperature thereby causing the gaseous molecules to react and nucleate to form a plurality of boron nitride nanoparticles. Depending on processing temperatures, the boron nitride nanoparticles may include amorphous forms, crystalline forms, or combinations thereof. Precursor molecules may include ammonia borane, borazine, cycloborazanes, polyaminoborane, polyiminoborane, and mixtures thereof. The boron nitride nanoparticles may be incorporated into a variety of dispersions, composites, and coatings; and in one embodiment, may be a component of a propellant, wherein the boron nitride nanoparticles may confer a range of advantages to gun barrels in which such propellants may be fired.

20140045081, Feb 13, 2014

Aug 9, 2013

13/963611

Christopher T. Holt - Bexley OH, US
Michael G. Beachy - Gahanna OH, US

pH Matter, LLC - Columbus OH

H01M 4/86
H01M 4/88

429405, 429535

A method for making a doped carbon bifunctional electrode capable of facilitating the oxygen reduction reaction and the oxygen evolution reaction that is not susceptible to performance degradation when operated bi-functionally for oxygen reduction and evolution.In one embodiment, a doped carbon catalyst is prepared by mixing a metal precursor with a high surface area support, impregnated with at least one organic phosphorus and/or organic nitrogen compound, and then pyrolyzed at high temperature under an inert or reducing atmosphere containing volatile carbon and/or nitrogen species. The doped-carbon catalyst may be coated on a conductive porous support and dispersed as an ink infiltrated into a porous conductive support.In another embodiment, a catalyst precursor, such as an iron salt and/or cobalt salt solution mixed with a binder, such as cellulosic binder, is infiltrated into a porous support, and pyrolized such that carbon catalyst fibers are anchored directly on the support.

20210036352, Feb 4, 2021

Oct 19, 2020

17/074297

- Columbus OH, US
Christopher T. Holt - Bexley OH, US
Minette Ocampo - Columbus OH, US
Paul H. Matter - Columbus OH, US

H01M 8/1004
H01M 8/0438
H01M 8/18
H01B 1/12
C25B 9/10
C25B 1/10
H01M 8/023
H01M 8/0271

A novel electrochemical cell is disclosed in multiple embodiments. The instant invention relates to an electrochemical cell design. In one embodiment, the cell design can electrolyze water into pressurized hydrogen using low-cost materials. In another embodiment, the cell design can convert hydrogen and oxygen into electricity. In another embodiment, the cell design can electrolyze water into hydrogen and oxygen for storage, then later convert the stored hydrogen and oxygen back into electricity and water. In some embodiments, the cell operates with a wide internal pressure differential.

20180327917, Nov 15, 2018

Apr 19, 2018

15/957052

- Columbus OH, US
Christopher T. Holt - Bexley OH, US
Minette Ocampo - Columbus OH, US
Paul H. Matter - Columbus OH, US

C25B 9/08
C25B 1/10

A novel electrochemical cell is disclosed in multiple embodiments. The instant invention relates to an electrochemical cell design. In one embodiment, the cell design can electrolyze water into pressurized hydrogen using low-cost materials. In another embodiment, the cell design can convert hydrogen and oxygen into electricity. In another embodiment, the cell design can electrolyze water into hydrogen and oxygen for storage, then later convert the stored hydrogen and oxygen back into electricity and water.

20150232336, Aug 20, 2015

Apr 29, 2015

14/698906

- Columbus OH, US
Christopher T. Holt - Bexley OH, US
Michael G. Beachy - Columbus OH, US

C01B 21/064
B01F 3/12
B01F 15/00
C08K 3/38
C09D 1/00

A method of forming boron nitride nanoparticles. A plurality of precursor molecules comprising boron, nitrogen and hydrogen may be decomposed in a first heating zone to form a plurality of gaseous molecules that contain bonded boron and nitrogen, followed by heating to a second, higher temperature thereby causing the gaseous molecules to react and nucleate to form a plurality of boron nitride nanoparticles. Depending on processing temperatures, the boron nitride nanoparticles may include amorphous, crystalline, and spherical forms, or combinations thereof. Precursor molecules may include ammonia borane, borazine, cycloborazanes, polyaminoborane, polyiminoborane, and mixtures thereof. The boron nitride nanoparticles may be incorporated into a variety of dispersions, composites, and coatings; and in some embodiments, may be a component of a propellant.