Wai W Wong

US Patent:

6349264, Feb 19, 2002

Filed:

Aug 12, 1998

Appl. No.:

09/133292

Inventors:

Norman K. Rhett - San Ramon CA
Ken K. Tseung - Fremont CA
Mark V. Corl - Fremont CA
Wai Bun Wong - Fremont CA
Ngoc Van Le - Milpitas CA

Assignee:

Lab Vision Corporation - Fremont CA

International Classification:

G01N 3353

US Classification:

702 19, 702 31, 422 63, 422 67

Abstract:

To simplify the process of preparing microscope slides, an automatic staining apparatus is disclosed. The disclosed automatic staining apparatus comprises an electromechanical automatic staining device that is coupled to a personal computer system using an interface card. An autostainer control program runs on the personal computer system. The autostainer control program allows a user to simply program the automatic staining apparatus using simple commands entered in the graphical user interface. The autostainer control program includes several features that simplify the programming such as safeguards that ensure compatible reagents are being used; automatic buffer solution requirement calculator; and the ability to determine optimal staining procedure. The electromechanical automatic staining device includes features such as dual waste bins for hazardous and nonhazardous waste storage, an automatic dispenser cleansing system; and slide clip that minimizes capillary effect.

US Patent:

6369570, Apr 9, 2002

Filed:

Dec 21, 2000

Appl. No.:

09/747818

Inventors:

Wai Ha Wong - San Jose CA
Subramaniam Sukumar - Union City CA

Assignee:

Varian, Inc. - Palo Alto CA

International Classification:

G01V 300

US Classification:

324318, 324320, 324307

Abstract:

A birdcage-like coil with a pair of electrically conductive ring elements separated in a longitudinal direction and interconnected by three longitudinally extending electrically conductive elongated strips, two of which are diametrically oppositely disposed and the third is azimuthally at 90E from both of them, can create an RF magnetic field gradient when driven in a certain resonance mode. A similarly structured birdcage-like coil with a fourth strip to have two diametrically oppositely disposed strips can create two switchable orthogonal magnetic field gradient by switching off a selected one of the strips and driving the coil in a certain mode. A coil for generating alternative a homogeneous field and selectably one of two orthogonal gradient fields is formed by sandwiching a prior art birdcage long-pass coil with a pair of such coils and by switching on and off suitable ones of the switches in the strips.

US Patent:

6377047, Apr 23, 2002

Filed:

Jun 8, 2000

Appl. No.:

09/589847

Inventors:

Wai Ha Wong - San Jose CA
Marco A. Romo - Castro Valley CA

Assignee:

Varian, Inc. - Palo Alto CA

International Classification:

G01V 300

US Classification:

324318, 324322

Abstract:

Superconducting birdcage coil with low-pass and high-pass coil configurations are formed by using strips each with an elongated sapphire substrate with a layer of a high temperature superconductor (HTS) material grown in a wavy pattern over its entire length on one of its main surfaces. A low-pass coil is formed with a pair of ring elements made of an electrically conductive metal and a plurality of such strips arranged parallel to one another and interconnecting these ring elements at junctions which are spaced peripherally along each of the rings. At each of the junctions, the ring element and the HTS layer form a capacitance. A highpass coil is formed by a plurality of such strips each with electrodes of the HTS material also grown at two end positions separated from each other on the other main surface of its sapphire substrates. These strips are arranged parallel to each other and sequentially around a central axis, each lying in a plane which includes the center axis. The electrodes and the HTS layers on mutually adjacent pairs of strips are closely in face-to-face relationship so as to serve as the ring part of a birdcage configuration containing capacitors.

US Patent:

6420871, Jul 16, 2002

Filed:

Mar 2, 2001

Appl. No.:

09/798322

Inventors:

Wai Ha Wong - San Jose CA
Seiji Unno - Santa Clara CA
Weston A. Anderson - Palo Alto CA

Assignee:

Varian, Inc. - Palo Alto CA

International Classification:

G01V 300

US Classification:

324318, 324320, 324322

Abstract:

A multiple tuned birdcage coil structure has a plurality of birdcage coils arranged coaxially one inside another around a central axis. Each of the birdcage coils has two conductor rings separated along the central axis and a plurality of mutually separated and parallel linearly elongated conductor legs and generates B field which rotates around the central axis by a specified twist angle between the two rings. The twist angles of different ones of these birdcage coils are different by an integral multiple of 360 degrees such that the assembled birdcage coils are mutually inductively transparent. Such a multiple tuned birdcage coil structure may be formed by assembling individually prepared single tuned birdcage coils each having a specified twist angle with a cylindrically shaped insulating bodies in between. A double tuned birdcage coil structure with two birdcage coils may be produced by providing a single printed circuit substrate with metallic sheets laminated on an insulating sheet, etching the metallic sheets to form appropriate patterns, rolling the substrate into a cylindrical form and soldering together appropriate portions of ring-forming parts to form conductor rings directly connected to or capacitively coupled to spirally birdcage legs.

US Patent:

6552544, Apr 22, 2003

Filed:

Apr 5, 2001

Appl. No.:

09/828319

Inventors:

Wai Ha Wong - San Jose CA
Alan R. Rath - Fremont CA

Assignee:

Varian, Inc. - Palo Alto CA

International Classification:

G01V 300

US Classification:

324318, 324322

Abstract:

A detunable coil assembly includes a main coil which resonates at a specified resonance frequency and a switchable detuning coil which, when switched on, becomes inductively coupled to the main coil and serves to detune it from its resonance frequency. The detuning coil and the main coil are electrically insulated from each other. The main coil may be of a multiply tuned kind and it may be detuned from more than one of its specified resonance frequencies at the same time by switching on the detuning coil.

US Patent:

6590394, Jul 8, 2003

Filed:

Sep 28, 2001

Appl. No.:

09/967819

Inventors:

Wai Ha Wong - San Jose CA

Assignee:

Varian, Inc. - Palo Alto CA

International Classification:

G01V 300

US Classification:

324318, 324322

Abstract:

A phase-shifted coil comprises nested concentric spiral portions, the terminals of which are progressively offset. Separately tuned concentric such coils of different dimensions exhibit relatively close intercoil clearance in one dimension and relatively large clearances in the orthogonal dimension provide different flux return characteristics for selective RF coupling.

US Patent:

6667674, Dec 23, 2003

Filed:

Apr 12, 2002

Appl. No.:

10/122055

Inventors:

Thomas de Swiet - Redwood City CA
Wai Ha Wong - San Jose CA
Marco Romo - Castro Valley CA
James Finnigan - Santa Clara CA
Sean Burns - Mountain View CA

Assignee:

Varian, Inc. - Palo Alto CA

International Classification:

H01P 700

US Classification:

333219, 324318

Abstract:

A birdcage resonator has a pair of conductor rings separated from each other along a central axis and a plural number of axially disposed conductor rungs, which extend between the rings and are evenly spaced around the central axis. Each of the rungs has a sectional shape with thickness or a radial extension comparable to or greater than its width or its azimuthal extension. Measures of the width and thickness of the rungs may be determined by using them as parameters to calculate the values of Q factor from an analytical procedure to locate parameter value ranges corresponding to maximal Q. Geometric calculations for filling factor yield ranges of parameters providing for compromise parameter values. Saddle coils have been found to exhibit similar enhancement of Q with radially oriented conductor cross section.

US Patent:

6735531, May 11, 2004

Filed:

Nov 13, 2001

Appl. No.:

10/010830

Inventors:

Norman K. Rhett - San Ramon CA
Ken K. Tseung - Fremont CA
Mark V. Corl - Castro Valley CA
Wai Bun Wong - Fremont CA
Ngoc Van Le - Milpitas CA
Glenn K. Takayama - Danville CA

Assignee:

Lab Vision Corporation - Fremont CA

International Classification:

G01N 3353

US Classification:

702 31, 702 19, 422 63, 422 67

Abstract:

To simplify the process of preparing microscope slides, an automatic staining apparatus is disclosed. The disclosed automatic staining apparatus comprises an electromechanical automatic staining device that is coupled to a personal computer system using an interface card. An autostainer control program runs on the personal computer system. The autostainer control program allows a user to simply program the automatic staining apparatus using simple commands entered in the graphical user interface. The autostainer control program includes several features that simplify the programming such as safeguards that ensure compatible reagents are being used; automatic buffer solution requirement calculator; and the ability to determine optimal staining procedure. The electromechanical automatic staining device includes features such as dual waste bins for hazardous and nonhazardous waste storage, an automatic dispenser cleansing system; and a slide clip that minimizes capillary effect.