David W Snyder

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:

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.

US Patent:

42577390, Mar 24, 1981

Filed:

Sep 11, 1978

Appl. No.:

5/941255

Inventors:

Cecil E. Covington - Hurst TX
David E. Snyder - Arlington TX
Walter G. Sonneborn - Fort Worth TX
Wesley L. Cresap - Fort Worth TX

Assignee:

Textron, Inc. - Providence RI

International Classification:

B64C 2738

US Classification:

416134A

Abstract:

A helicopter rotor hub assembly (10) in which a blade grip (30) extends inboard of a yoke (14) and transfers centrifugal forces to the yoke (14) through a spherical elastomeric bearing (38). Pitch change of the grip (30) and blade (32) is accommodated by the spherical elastomeric bearing (38) which also acts as the pivot point for lead-lag motion of the blade (32) and grip (30). A lead-lag damper (22) is located inboard of the elastomeric bearing (38) and is connected between one end of the grip (30) spaced away from the lead-lag pivot and the yoke (14) for damping the lead-lag motion between the grip (30) and yoke (14).

US Patent:

44021712, Sep 6, 1983

Filed:

Jan 22, 1982

Appl. No.:

6/341797

Inventors:

David R. Snyder - Hurst TX

International Classification:

E04B 100

US Classification:

52741

Abstract:

A device is shown for securing the base portion of a channel member of the type used to support a partition in a building to a ceiling grid structure. The device includes a bracket which is received on the ceiling structure. The channel member is secured to the bracket to support the channel member from the ceiling grid structure without damaging or contacting the ceiling grid structure itself. The bracket is then fastened to the ceiling grid structure to prevent transverse movement of the channel member along the ceiling grid structure. That portion of the ceiling grid structure which is visible within the completed building interior is not damaged when the partition is removed or relocated.