Hong W Wan, 61120 New Castle Ln, Tyrone, GA 30290

6529114, Mar 4, 2003

May 27, 1998

09/085858

Michael J. Bohlinger - Minnetonka MN
Tamara K. Bratland - Minneapolis MN
Hong Wan - Maple Grove MN

Honeywell International Inc. - Morristown NJ

H01L 4300

338 32R, 338 32 H, 324252

Two sensor units are formed from magnetoresistive material. Elements of the first sensor unit have a total anisotropy field in a first direction. Elements of the second sensor unit have a total anisotropy field in a second direction. An integral coil sets a direction of magnetization in the elements of the first and second sensor units. An output of the first sensor unit is representative of magnetic field components perpendicular to the first direction and an output of the second sensor is representative of magnetic field components perpendicular to the second direction.

6667682, Dec 23, 2003

Dec 26, 2001

10/035957

Hong Wan - Plymouth MN
Lakshman S. Withanawasam - Maple Grove MN

Honeywell International Inc. - Morristown NJ

H01L 4300

338 32R, 338 12, 338 13, 338 14

An integrated dual-purpose sensor is shown. The dual-purpose sensor in one embodiment of the present invention includes a full Wheatstone bridge or a half Wheatstone bridge providing two output measurements. Specifically, the Wheatstone bridge provides two output measurements that are utilized to determine a temperature sensor reading and a magnetic sensor reading.

6707293, Mar 16, 2004

Nov 15, 2001

10/002454

Hong Wan - Plymouth MN
Tamara Bratland - Plymouth MN

Honeywell International Inc. - Morristown NJ

G01B 730

32420725, 3242072, 32420721, 32420714

By combining outputs from a Hall sensor and a magnetoresistive (MR) sensor, a 360-degree rotary position sensor can be achieved. The Hall sensor and the MR sensor both detect a magnetic field produced by a magnet. The Hall sensor detects the polarity of the magnetic field, while the MR sensor detects the angular position of the magnetic field, up to 180-degrees. With a positive output from the Hall sensor, the first 180-degrees of the angular position is detected. With a negative output from the Hall sensor, the second 180-degrees of the angular position is detected.

6750751, Jun 15, 2004

Aug 1, 2002

10/211906

Hong Wan - Maple Grove MN

Honeywell International, Inc. - Morristown NJ

H01F 500

336200, 324114, 324249, 324252

An integrated circuit signal isolator includes a magnetic field sensor in a first metal layer formed over a semiconductor substrate. A first dielectric layer is formed over the first metal layer, and an input coil in a second metal layer is formed over the first dielectric layer. Additionally, a second dielectric layer is formed over the second metal layer, and a feedback coil in a third metal layer is formed over the second dielectric layer. The feedback coil is coupled to an output of the magnetic field sensor.

6836971, Jan 4, 2005

Jul 30, 2003

10/630187

Hong Wan - Plymouth MN, US

Honeywell International Inc. - Morristown NJ

G01C 1738

33356

A tilt-compensated electronic compass can be realized by calculating rather than measuring Earth's magnetic field component Z in a direction orthogonal to the two measurement axes of a 2-axis magnetic sensor. The orthogonal component Z can be calculated using a stored value for the Earth's magnetic field strength applicable over a wide geographic region. The calculation also requires using measured field values from the 2-axis sensor. Once Z is known, and using input from a 2-axis tilt sensor, compensated orthogonal components X and Y can be calculated by mathematically rotating the measured field strength values from a tilted 2-axis sensor back to the local horizontal plane. Thus, a very flat and compact tilt-compensated electronic compass is possible.

6960974, Nov 1, 2005

Nov 14, 2002

10/294105

Hong Wan - Plymouth MN, US
Edgar R. Mallison - Wayzata MN, US
Michael L. Freeman - St. Paul MN, US

Honeywell International Inc. - Morristown NJ

H01F007/02
H01H055/00

335215, 340547, 335207

A smart switch has a magnetic operator, at least one magnetic sensor located to sense movement of the magnetic operator, and a processor that processes an output of the magnetic sensor so as to detect right and left over travel ranges and a normal operating range of the magnetic operator. The magnetic sensor may be a magnetoresistive sensor.

6984978, Jan 10, 2006

Feb 11, 2002

10/073542

Hong Wan - Maple Grove MN, US
Jay R. Goetz - Deephavon MN, US

Honeywell International Inc. - Morristown NJ

G01R 33/02

324252, 324244

An integrated magnetic field sensing device includes at least two magnetoresistive elements which are biased in a first direction by an integral conductor and are sensitive to magnetic field components in a direction perpendicular to the first direction. The sensitivity of the device to a magnetic field is adjustable and is related to the level of the bias current. In a current measuring application, two of the magnetic field sensing devices are mounted on opposite sides of and perpendicular to a conductor carrying a current to be measured. In a portable current measuring apparatus, two of the magnetic field sensors are mounted in a housing that assists in locating the magnetic field sensors relative to the conductor carrying the current to be measured.

7005958, Feb 28, 2006

Jun 14, 2002

10/171884

Hong Wan - Plymouth MN, US

Honeywell International Inc. - Morristown NJ

H01C 7/04

338 32R, 324252

A two-axis magnetic field sensor includes a substrate, a first sensor having at least one magnetoresistive element formed of GMR material on the substrate has a free layer having an easy axis of effective anisotropy field in a first direction. The first sensor is sensitive to magnetic field components perpendicular to the first direction. A current is caused to flow through the first sensor and variations in the resistivity of the first sensor due to the first magnetic field components are sensed. A second sensor having at least one magnetoresistive element formed of GMR material on the substrate has a free layer having an easy axis of effective anisotropy field in a direction substantially perpendicular to the first direction. The second sensor is sensitive to second magnetic field components perpendicular to its easy axis of effective anisotropy. A current is caused to flow through the second sensor and variations in the resistivity of the second sensor due to second magnetic field components are sensed.