Michael Andrews
Engineers at Manchester Ct, Fort Collins, CO

6150802, Nov 21, 2000

Aug 28, 1998

9/143477

Michael Andrews - Fort Collins CO

Hewlett-Packard Company - Palo Alto CA

G05F 140, H02M 3335

323282

An adjustable voltage controlled current source for supplying a constant current to a load may comprise a DC to DC switcher in a commonly known topology, including boost, buck, or boost/buck. The current from the DC to DC switcher is measured with one or more current sensing resistors or one or more inductively coupled current sensing windings such as a transformer or Hall-effect device. The current measurement is then coupled to the feedback input of the DC to DC switcher. The current measurement may have a DC bias added to meet the feedback voltage requirements of the DC to DC switcher. An external current set point may be combined with the current measurement to externally set the current output.

6633332, Oct 14, 2003

May 13, 1999

09/311517

Kevin W Nay - Fort Collins CO
Michael Andrews - Fort Collins CO
Richard L Kochis - Ft Collins CO

Hewlett-Packard Development Company, L.P. - Houston TX

H04N 5225

3482201, 34820799, 348239

A digital camera system is provided for capturing pictures of scenery or scanning the text of a document. A lens of the digital camera system receives light from a scene, and a conversion device defines a first set of digital data based on this light. A scanning mechanism included within the digital camera system scans a document as the system is passed over the surface of the document and produces a second set of data that defines an image of the document. An audio signal interface included within the digital camera system receives an audio message and defines a third set of digital data based on the audio message. A system controller stores the first, second, and third sets of data into a storage device. If desired, the first and second sets of data may be merged together to define a combined image depicting at least a portion of the scene defined by the first set of digital data and depicting at least a portion of the document defined by the second set of digital data.

6833693, Dec 21, 2004

Apr 30, 2003

10/426434

Michael Andrews - Fort Collins CO

Agilent Technologies, Inc. - Palo Alto CA

G05F 140

323288

A switching control circuit for a switching power converter utilizes an oscillating signal that causes reduced electromagnetic interference by the power converter by way of modulating the frequency of the oscillating signal within a specified frequency range. An output voltage monitor circuit monitors the output voltage of the power converter, thus producing an output voltage monitor signal. Also, a randomized signal generator creates a randomized signal, which is then used to drive a frequency range converter that is employed to produce a frequency modulation signal. The current state of the frequency modulation signal is based on the current state of the randomized signal, with the frequency range converter limiting the current state of the frequency modulation signal so that the oscillating signal will only operate within the specified frequency range. A variable frequency oscillator then generates the oscillating signal whose frequency is based on the current state of the frequency modulation signal. A comparator then compares the oscillating signal with the output voltage monitor signal to produce a switch control signal, which is then employed to control a switching element of the power converter.

6642914, Nov 4, 2003

Apr 13, 2000

09/548770

Michael Andrews - Fort Collins CO

Hewlett-Packard Development Company, L.P. - Houston TX

G09G 336

345 87, 345 43

An improved liquid crystal display includes overlapped electrical conductors in a picture element (pixel) region of a liquid crystal material. The conductors are selectively defined so as to control the electric field applied to the liquid crystal material in a region associated with the liquid crystal material. By controlling the electric field in the region, the degree to which the molecules in the liquid crystal material rotate in response to the electric field can be controlled. In this manner, the contrast of the liquid crystal material in the region may be selectively controlled to, for example, improve the contrast of the liquid crystal display in multiple axes.

6784625, Aug 31, 2004

Apr 30, 2003

10/426408

Michael Andrews - Fort Collins CO

Agilent Technologies, Inc. - Palo Alto CA

H05B 4116

315276, 375376

A switching control circuit for a voltage inverter generates an oscillating signal that causes reduced electromagnetic interference by the voltage inverter by way of modulating the frequency of the oscillating signal within a specified frequency range. A randomized signal generator creates a randomized signal, which is then used to drive a frequency range converter that is employed to produce a frequency modulation signal. The current state of the frequency modulation signal is based on the current state of the randomized signal, with the frequency range converter limiting the current state of the frequency modulation signal so that the oscillating signal will only operate within the specified frequency range. A variable frequency oscillator then generates the oscillating signal whose frequency is based on the current state of the frequency modulation signal. The oscillating signal is then inverted to produce an inverted oscillating signal, with both the oscillating signal and the inverted oscillating signal then driving the voltage inverter.

2004004, Mar 4, 2004

Sep 2, 2003

10/653299

Michael Andrews - Fort Collins CO, US

G02F001/1333

349/110000

An improved liquid crystal display includes overlapped electrical conductors in a picture element (pixel) region of a liquid crystal material. The conductors are selectively defined so as to control the electric field applied to the liquid crystal material in a region associated with the liquid crystal material. By controlling the electric field in the region, the degree to which the molecules in the liquid crystal material rotate in response to the electric field can be controlled. In this manner, the contrast of the liquid crystal material in the region may be selectively controlled to, for example, improve the contrast of the liquid crystal display in multiple axes.

6960961, Nov 1, 2005

Apr 30, 2003

10/426483

Michael Andrews - Fort Collins CO, US

Agilent Technologies, Inc. - Palo Alto CA

H01H031/02, H03B005/36

331 18, 331 19, 331 34, 331104, 375 1, 375 99, 375 96, 375103, 375 7, 455114, 455317

An electrical circuit generates an oscillating signal that produces reduced electromagnetic interference by way of modulation of the frequency of the oscillating signal within a specified frequency range. A randomized signal generator creates a randomized signal, which is then used to drive a frequency range converter that is employed to produce a frequency modulation signal. The current state of the frequency modulation signal is based on the current state of the randomized signal, with the converter limiting the current state of the frequency modulation signal so that the oscillating signal will only operate within the specified frequency range. A variable frequency oscillator then generates the oscillating signal whose frequency is based on the current state of the frequency modulation signal.

6031339, Feb 29, 2000

Jan 3, 1999

9/240793

Michael Andrews - Fort Collins CO

Hewlett-Packard Company - Palo Alto CA

H05B 3702

315224

An air gapped inductance and a capacitance form a series resonance that is itself in series with a flourescent tube. The resulting series resonant network is permanently connected to one (+) side of the DC supply, while the other end is switched between that (+) side of the DC supply and the other (-) side of the DC supply. Switching occurs in synchronism with the different polarities of the half-cycles for the current circulating in the resonant circuit. In series with the current in the resonant circuit is the primary of a phase splitter driver transformer having separate secondaries phased to control FET switches to do the aforementioned switching, and whose turns ratios are selected to determine the duty cycles with which the resonant circuit is switched. The switched end is connected to the one (+) end of the DC supply for its entire associated half cycle. For significantly less than the remaining half cycle it is switched to the other (-) side of the DC supply to restore energy to the circuit and replace that which has been dissipated in the flourescent lamp.

2003018, Oct 9, 2003

Jun 19, 2003

10/465703

Kevin Nay - Fort Collins CO, US
Michael Andrews - Fort Collins CO, US
Richard Kochis - Ft. Collins CO, US

H04N005/225

348/207990

A digital camera system is provided for capturing pictures of scenery or scanning the text of a document. A lens of the digital camera system receives light from a scene, and a conversion device defines a first set of digital data based on this light. A scanning mechanism included within the digital camera system scans a document as the system is passed over the surface of the document and produces a second set of data that defines an image of the document. An audio signal interface included within the digital camera system receives an audio message and defines a third set of digital data based on the audio message. A system controller stores the first, second, and third sets of data into a storage device. If desired, the first and second sets of data may be merged together to define a combined image depicting at least a portion of the scene defined by the first set of digital data and depicting at least a portion of the document defined by the second set of digital data.