David Marshall Snyder

US Patent:

6554467, Apr 29, 2003

Filed:

Feb 9, 2001

Appl. No.:

09/779470

Inventors:

David L. Snyder - Princeton TX
Karl J. Urquhart - McKinney TX
Richard Swindell - Bonham TX

Assignee:

LAir Liquide - Societe Anonyme aDirectoire et Conseil de Surveillance pour letude et lExploitation des Procedes Georges Claude - Paris
Air Liquide America, L.P. - Houston TX

International Classification:

B01F 1502

US Classification:

366348, 366136, 3661521, 366141, 451 60, 451 88, 451446

Abstract:

On-site blending and distribution of oxide abrasives with other constituents as used in semiconductor applications. Constituent blending is accomplished through weighing components individually into a blending tank. Some components may be added by injection or weight. Alternatively blends can be made to varying concentrations by passing the blended oxide solution in a closed circulation loop through a calibrated encapsulated torroid coil to measure electrical conductivity. The resulting conductivity output may be used to add one or more component.

US Patent:

6762832, Jul 13, 2004

Filed:

Jun 21, 2002

Appl. No.:

10/064222

Inventors:

Matthew L. Fisher - Allen TX
David L. Snyder - Princeton TX
Ashutosh Misra - Plano TX

Assignee:

Air Liquide America, L.P. - Houston TX

International Classification:

G01J 342

US Classification:

356300, 438 16

Abstract:

Provided are methods and systems for controlling the concentration of a component in a composition, and semiconductor processing methods and systems. One exemplary method of controlling the concentration of a component in a composition involves: providing a composition which has a liquid portion, wherein the liquid portion contains a component to be monitored; performing an absorption spectroscopy measurement on a sample of the composition; and controlling the concentration of the component in the composition based on the absorption spectroscopy measurement using a feedback control loop. The invention allows for controlling the concentration of a component in a composition, for example, a corrosion inhibitor in a chemical planarization (CMP) chemical, as well as in pre- and post-CMP storage/treatment chemicals, and can provide real time, accurate process control in a simple and robust manner.

US Patent:

6875415, Apr 5, 2005

Filed:

Apr 4, 2001

Appl. No.:

09/824741

Inventors:

Mary D. Havlicek - Richardson TX, US
David L. Snyder - Princeton TX, US
Joe G. Hoffman - Santa Fe NM, US
Marshall E. Cummings - Richardson TX, US

Assignee:

Air Liquide America, LP - Houston TX

International Classification:

C01B015/01

US Classification:

423584, 210692, 521 26, 521 28, 521 30

Abstract:

Provided are a preconditioned resin and methods of preparation thereof as well as methods for purifying hydrogen peroxide solutions. The method includes preconditioning an anion exchange resin, wherein an anion exchange resin bed is provided and carbon dioxide gas is passed through the resin bed.

US Patent:

6943878, Sep 13, 2005

Filed:

May 25, 2004

Appl. No.:

10/853497

Inventors:

Matthew L. Fisher - Allen TX, US
David L. Snyder - Princeton TX, US
Ashutosh Misra - Plano TX, US

Assignee:

Air Liquide Electronics U.S. LP - Houston TX

International Classification:

G01J003/42

US Classification:

356300, 438 16

Abstract:

Provided are methods and systems for controlling the concentration of a component in a composition, and semiconductor processing methods and systems. One exemplary method of controlling the concentration of a component in a composition involves: providing a composition which has a liquid portion, wherein the liquid portion contains a component to be monitored; performing an absorption spectroscopy measurement on a sample of the composition; and controlling the concentration of the component in the composition based on the absorption spectroscopy measurement using a feedback control loop. The invention allows for controlling the concentration of a component in a composition, for example, a corrosion inhibitor in a chemical planarization (CMP) chemical, as well as in pre- and post-CMP storage/treatment chemicals, and can provide real time, accurate process control in a simple and robust manner.

US Patent:

20020190002, Dec 19, 2002

Filed:

Apr 4, 2001

Appl. No.:

09/824771

Inventors:

Karl Urquhart - McKinney TX, US
Joe Hoffman - Dallas TX, US
David Snyder - Princeton TX, US
Vinod Raghavan - Dallas TX, US
Mary Havlicek - Richardson TX, US
John Geurian - Garland TX, US

International Classification:

B01D015/00

US Classification:

210/683000, 210/284000

Abstract:

Provided are cartridges, apparatuses and methods for purifying a liquid chemical. The cartridges include a conduit connected to receive a flow of a chemical to be purified. A packed section in the conduit comprises a purification material. The ratio of the length of the packed section to the inside diameter of the conduit is from about 8:1 to about 200:1. The flow of the chemical to be purified contacts the purification material, thereby producing a flow of a purified chemical. This invention has particular applicability to the semiconductor manufacturing industry.

US Patent:

42525047, Feb 24, 1981

Filed:

Oct 10, 1978

Appl. No.:

5/950088

Inventors:

Cecil E. Covington - Hurst TX
David E. Snyder - Arlington TX

Assignee:

Textron, Inc. - Providence RI

International Classification:

B64C 2750

US Classification:

416143

Abstract:

An apparatus is disclosed for folding a helicopter rotor blade (16) for storage. The blade (16) is secured to a grip (12) by blade bolts (18, 20) which are locked in place by a latch plate (22). Each bolt (18, 20) has an annular groove (30, 31) in which is mated a corresponding aperture (42, 46) in the latch plate (22). To fold the blade (16) the latch plate (22) is translated against the tension of spring (24) to expose a blade bolt (18) to an enlarged aperture (40). This bolt (18) can then be removed to permit pivoting of the blade (16) about the remaining bolt (20). To further secure the latch plate (22), a cap (54) is provided to lock the latch plate (22) to the blade bolt (18).

US Patent:

41206100, Oct 17, 1978

Filed:

May 16, 1974

Appl. No.:

5/470520

Inventors:

James L. Braswell - Hurst TX
Cecil E. Covington - Hurst TX
Nolan B. Phillips - Forth Worth TX
David E. Snyder - Arlington TX

Assignee:

Textron, Inc. - Providence RI

International Classification:

B64C 2748

US Classification:

416226

Abstract:

A helicopter main rotor blade having a metallic nose spar extending the length of the leading edge of the blade and a trailing edge skin attached to the nose spar. A closure channel fixed within the nose spar extends the length thereof with unidirectional fiberglass material fixed to and extending along the length of the closure channel. A bushing on the inboard end of the blade preferably is attached both to the nose spar and the fiberglass bands for transfer of centrifugal forces in the blade to a grip.

US Patent:

39429105, Mar 9, 1976

Filed:

May 13, 1974

Appl. No.:

5/469530

Inventors:

David E. Snyder - Arlington TX
Cecil E. Covington - Hurst TX

Assignee:

Textron, Inc. - Providence RI

International Classification:

B64C 2748

US Classification:

416141

Abstract:

A grip-yoke assembly for attaching a helicopter blade to the mast of the helicopter rotor having a conventional primary coupling to carry the centrifugal loads and a redundant path operative should the primary coupling fail to insure continued operability of the blade. In one embodiment, the redundant load path has a bearing surface formed on the inboard end of the grip and a corresponding thrust bearing mounted on an inboard yoke fitting for engagement with the bearing surface upon failure of the coupling. In an alternative embodiment, a bearing surface is formed on an outboard grip fitting and a corresponding thrust bearing is supported on the yoke outboard of the grip fitting.