Robert Eric Nast

US Patent:

6838880, Jan 4, 2005

Filed:

Mar 13, 2003

Appl. No.:

10/388369

Inventors:

Martin Hofmann - Rheinstetten, DE
Manfred Spraul - Ettlingen, DE
Robert Eric Nast - Saratoga CA, US
Damon Leslie Harris - Livermore CA, US

Assignee:

Bruker Biospin Corporation - Billerica MA

International Classification:

G01V 300

US Classification:

324318, 324319

Abstract:

A nuclear magnetic resonance (NMR) spectroscopy probe has a sample cell into and out of which a room temperature liquid sample may be directed. The cell is surrounded by a radio frequency coil that is used to perform NMR measurements of the liquid sample, and which is maintained at cryogenic temperatures. The coil is separated from the sample cell by a thermally insulative boundary, such as a vacuum. The sample may enter the cell through an input path, and may exit through an output path. The input path, output path and sample cell may be surrounded by a sheath through which flows room temperature gas. The ends of the sample cell may be tapered to promote thorough flow through the cell, and flow diverters may be included in the sample cell adjacent to the input and output paths to force flow to the outer wall of the sample cell.

US Patent:

6842004, Jan 11, 2005

Filed:

Apr 28, 2003

Appl. No.:

10/424687

Inventors:

Richard S. Withers - Sunnyvale CA, US
Robert E. Nast - Saratoga CA, US

Assignee:

Bruker Biospin Corp. - Billerica MA

International Classification:

G01V 300

US Classification:

324318, 324322

Abstract:

Improved superconducting coils for a nuclear magnetic resonance probe use capacitive elements that are located in regions further from an active sample volume than magnetic field generating elements to which they are electrically connected. The sample volume is a substantially oblong shape, and the magnetic field generating elements run substantially parallel to the major axis of the shape, while the capacitor elements run perpendicular to the major axis. Gaps between the capacitor elements, and the width of the elements themselves, may increase toward the outside of the coil to minimize electrical discharge. The variation may be according to a monotonic, possibly linear, function. Discharge may also be minimized by using a dielectric cover that, together with a coil substrate, encloses the coil.

US Patent:

7701217, Apr 20, 2010

Filed:

Aug 7, 2008

Appl. No.:

12/187691

Inventors:

Richard S. Withers - Sunnyvale CA, US
Robert E. Nast - Saratoga CA, US
Weston A. Anderson - Palo Alto CA, US

Assignee:

Varian, Inc. - Palo Alto CA

International Classification:

G01V 3/00

US Classification:

324318, 324322

Abstract:

RF electric fields produced by electric potential differences in NMR probe coil windings may penetrate the NMR sample and sample tube causing sensitivity loss and noise in NMR spectroscopy. Counter-wound spiral coils placed on the opposite surfaces of a planar substrate or on two adjacent planar substrates produce electric potentials that minimize the electric field over the sample region, thereby increasing the sensitivity of the NMR probe. Alternatively counter-wound spiral coils placed adjacent to each other on the outer surface of two concentric cylindrical surfaces that surround the NMR sample minimize the electric field over the sample region. The electric potential of the spiral coils is reduced by adjusting a length of at least one coil.

US Patent:

58297910, Nov 3, 1998

Filed:

Sep 20, 1996

Appl. No.:

8/717298

Inventors:

Vincent Y. Kotsubo - Sunnyvale CA
Robert E. Nast - San Jose CA

Assignee:

Bruker Instruments, Inc. - Billerica MA

International Classification:

F16L 3500

US Classification:

285 26

Abstract:

An insulated dual-bayonet connector is provided. The connector provides simple alignment and connection for both fluid tubes of a fluid recirculation system. The connector is especially useful for closed-cycle systems, but is also useful for open-cycle gas systems where it is desired to vent a gas in a desired location remote from the item to be cooled or heated by the gas.