Andrew M Matheson

US Patent:

7166952, Jan 23, 2007

Filed:

Sep 26, 2002

Appl. No.:

10/491220

Inventors:

Richard Topliss - Cambridge, GB
David Livingstone - Hertfordshire, GB
Andrew Matheson - Belmont MA, US
Gareth McKevitt - Cambridge, GB
Mark Richard Shepherd - Hertfordshire, GB
Anthony Hooley - Cambridge, GB

Assignee:

1. . . Limited - Cambridge

International Classification:

H01L 41/08

US Classification:

310330, 310367, 310368, 310369

Abstract:

An equivalent to the spatial separation either side of a nominal median plane that is inherent in a bimorph (with one piezoelectric layer on one side, and the second on the other side of the plane) is attained by structurally shaping the cross-section of a simple, single piezoelectric layer () such that it has a multiplicity of piezoelectric portions arranged in two generally-planar groups one either side of a median plane, so that any dimension change undergone by a portion on one side of that plane will tend to bend the whole device in the opposite direction to the same sense dimension change undergone by a portion on the other side of that plane. The simple, single layer acts as though it were a bimorph if elongate and beam-like, bending along its length, one end moving up/down, or back/forth, relative to the other but with any need for an internal, electrode.

US Patent:

7302068, Nov 27, 2007

Filed:

Jun 19, 2002

Appl. No.:

10/480733

Inventors:

Simon Andrew Longbottom - Cambridge, GB
Andrew Matheson - Belmont MA, US
Gareth McKevitt - Cambridge, GB
Richard Topliss - Cambridge, GB
Matthew John Pitts - Cambridge, GB
Mark Richard Shepherd - Hertfordshire, GB

Assignee:

1 . . .Limited - Cambridge

International Classification:

H04R 25/00

US Classification:

381162, 381152

Abstract:

A loudspeaker for audible sound is described having a sound emitting element mounted onto a support structure and at least one actuator adapted to rotate said sound emitting element around a hinge section, wherein the actuator is made of piezoelectric material. In variants the actuator forms part of the hinge section and the loudspeaker is capable of generating vibrations through its support structure.

US Patent:

20100154475, Jun 24, 2010

Filed:

Jan 28, 2010

Appl. No.:

12/695360

Inventors:

Andrew Matheson - Belmont MA, US
John W. Koenitzer - Carlisle MA, US

International Classification:

C01B 33/021
C03B 19/02
C03B 32/00

US Classification:

65 332, 423350

Abstract:

This invention relates to a process for the production of high purity elemental silicon by reacting silicon tetrachloride with a liquid metal reducing agent in a two reactor vessel configuration. The first reactor vessel is used for reducing the silicon tetrachloride to elemental silicon, resulting in a mixture of elemental silicon and reducing metal chloride salt while the second reactor vessel is used for separating the elemental silicon from the reducing metal chloride salt. The elemental silicon produced using this invention is of sufficient purity for the production of silicon photovoltaic devices or other semiconductor devices.

US Patent:

20120045383, Feb 23, 2012

Filed:

Sep 6, 2011

Appl. No.:

13/225770

Inventors:

Andrew Matheson - Belmont MA, US
John W. Koenitzer - Carlisle MA, US

International Classification:

C01B 33/02
C01B 33/037
C01B 33/021

US Classification:

423350, 423349

Abstract:

Disclosed is method for the production of silicon metal of a purity sufficient for the manufacture of commercial grade photovoltaic devices, by first reacting liquid silicon tetrachloride with molten sodium metal, and then by processing the reaction product to remove from the silicon metal, those reaction products which would be detrimental to the performance of the produced silicon metal in commercial grade photovoltaic devices used to generate electric power for commercial sale.

US Patent:

20120167716, Jul 5, 2012

Filed:

Jan 16, 2012

Appl. No.:

13/350854

Inventors:

Andrew Matheson - Belmont MA, US

International Classification:

B22F 1/00
B22F 9/02

US Classification:

75308, 75331, 75228

Abstract:

The present invention is directed to a method of manufacture of metal or alloy powders that uses liquid phase reduction of a metal halide, or a mixture of metal halides, to produce a metal particle coated in salts produced as a reaction byproduct. The reaction conditions can be chosen to select a range of metal particle sizes, and the salt coating prevents oxidation (or reaction with other atmospheric gases) and permits a range of applications hitherto difficult to achieve using metal powders.

US Patent:

20140061549, Mar 6, 2014

Filed:

Nov 13, 2013

Appl. No.:

14/078871

Inventors:

Andrew Matheson - Belmont MA, US

Assignee:

Boston Electronic Materials, LLC - Belmont MA

International Classification:

H01B 5/00
C23C 14/34
H01B 13/30

US Classification:

252512, 427 79, 20429813

Abstract:

Disclosed is a process to reduce mixtures of at least one metal halide by molten metal reduction of the liquid phase metal halide in an alkali or alkaline earth metal to form a reaction product comprising at least one metal mixture and a halide salt coating, in which the at least one metal halide is in stoichiometric excess to the molten metal reductant and wherein the reductant is consumed in the reaction and does not need to be removed at the end of the reaction.

US Patent:

20140072498, Mar 13, 2014

Filed:

Nov 13, 2013

Appl. No.:

14/078927

Inventors:

Andrew Matheson - Belmont MA, US

Assignee:

Boston Silicon Materials, LLC - Belmont MA

International Classification:

C01B 33/027

US Classification:

423350, 20429813

Abstract:

A method of manufacture is described that uses liquid phase reduction of silicon hydride, to produce silicon metal. Working in liquid phase permits a more compact plant design and offers significantly lower capital costs.

US Patent:

20200023440, Jan 23, 2020

Filed:

Feb 22, 2019

Appl. No.:

16/282385

Inventors:

- Boston MA, US
Andrew Matheson - Belmont MA, US
Richard Van Lieshout - New Freedom PA, US
Donald Finnerty - New Freedom PA, US
John W. Koenitzer - Carlisle MA, US

International Classification:

B22F 9/24
B22F 9/20
C22B 5/04

Abstract:

A method for producing a metal powder includes maintaining molten reducing metal in a sealed reaction vessel that is free of added oxygen and water, establishing a vortex in the molten reducing metal, introducing a metal halide into the vortex so that the molten reducing metal is in a stoichiometric excess to the metal halide, thereby producing metal particles and salt, removing unreacted reducing metal, removing the salt, and recovering the metal powder. The molten reducing metal can be a Group I metal, a Group II metal, or aluminum.