David W Sykes

US Patent:

7834592, Nov 16, 2010

Filed:

Sep 25, 2008

Appl. No.:

12/238271

Inventors:

Pete Ward Smith - Southlake TX, US
James Earl Huffman - Keller TX, US
David Lee Sykes - Keller TX, US
Clyde Ray Calcote - Richardson TX, US

Assignee:

PulseTech Products Corporation - Southlake TX

International Classification:

H02J 7/10

US Classification:

320141, 320139, 320145, 327131, 327134, 327135, 327137, 327140, 363 20, 363 2101, 363 2108, 363 211

Abstract:

A circuit includes a pulse transformer having primary and secondary windings. An oscillating waveform is applied to the primary winding to induce an oscillating waveform at the secondary winding. A transistor in series with a first resistor is coupled between the secondary winding and the ground. An R-C network formed by a second and a third resistor and a capacitor is coupled to a base junction of the transistor. The R-C network causes a slow, tapered linear pinch off of the transistor's conductance to enable the circuit to output a triangular waveform, which is characterized by a relatively short linear rise time followed by a substantially long linear fall time. The R-C network is coupled to the secondary winding via a first and a second diode, respectively.

US Patent:

8269465, Sep 18, 2012

Filed:

Sep 25, 2008

Appl. No.:

12/238143

Inventors:

Pete Ward Smith - Southlake TX, US
James Earl Huffman - Keller TX, US
David Lee Sykes - Keller TX, US
Clyde Ray Calcote - Richardson TX, US

Assignee:

PulseTech Products Corporation - Southlake TX

International Classification:

H02J 7/04

US Classification:

320141, 320139, 320145

Abstract:

A circuit charges and maintains a battery. The circuit includes a microprocessor for receiving a current sense signal and a voltage sense signal. The microprocessor generates control signals for selectively operating the circuit in a charging mode and in a maintenance mode. The circuit includes a current sense circuit for measuring the battery's current consumption and generating the current sense signal responsive to the measured current consumption. The circuit includes a voltage sense circuit for measuring the battery's voltage and generating the voltage sense signal responsive to the measured battery voltage. The circuit includes a waveform generator circuit for receiving the control signals, and operating in response thereto to apply a charging signal to the battery when in the charging mode and to deactivate the charging signal when in the maintenance mode. The charging signal has an oscillating triangular waveform superimposed on a DC bias signal.

US Patent:

8269466, Sep 18, 2012

Filed:

Sep 25, 2008

Appl. No.:

12/238212

Inventors:

Pete Ward Smith - Southlake TX, US
James Earl Huffman - Keller TX, US
David Lee Sykes - Keller TX, US
Clyde Ray Calcote - Richardson TX, US

Assignee:

PulseTech Products Corporation - Southlake TX

International Classification:

H02J 7/04

US Classification:

320141, 320139, 320145

Abstract:

A method for charging a battery includes measuring the battery's voltage and comparing the battery voltage to a first threshold voltage. The method includes operating the battery in a charging mode if the measured battery voltage is less than the first threshold voltage, wherein operating in the charging mode comprises applying a charging signal to the battery. The charging signal has an oscillating triangular waveform superimposed on a DC bias signal. The method includes measuring the battery's current consumption and comparing the current consumption to a first threshold current. The method includes operating in a maintenance mode if the battery's current consumption is less than the first threshold current, wherein operating in the maintenance mode comprises terminating application of the charging signal to the battery. The method includes measuring, during operation in the maintenance mode, the battery's voltage and comparing the measured voltage to a second threshold voltage. The method includes applying the oscillating triangular waveform superimposed on the DC bias signal until the battery's voltage is equal to or greater than the second threshold voltage.

US Patent:

20020137199, Sep 26, 2002

Filed:

Oct 22, 2001

Appl. No.:

10/011237

Inventors:

Michael Jobin - Boston MA, US
Andrew Muir - Cohasset MA, US
David Sykes - Cambridge MA, US
James Woodward - Milton MA, US

International Classification:

C12M001/34

US Classification:

435/287200

Abstract:

Disclosed are devices and methods for the storage, shipment, moving and/or transferring, mixing, reacting, isolation, conditioning, lyophilization, stabilization, metering, dispensing, detecting, manipulation and management of materials, particularly solids, powders and liquids. Each such device or method provides a means of storing one or more quantities of one or more materials in one or more reservoirs, optionally protecting said quantities from air, moisture or light. Optionally, multiple such reservoirs may be placed or arranged in ensembles such as in arrays or other physical patterns, optionally providing for the simultaneous, parallel or rapid access to more than one such reservoir at once. Devices and methods of the invention may also be configured to deliver material from a reservoir in such manner that a defined or desired quantity of material is dispensed from the reservoir or that such dispensing is performed at a defined or desired rate or that the material is dispensed until one or more criteria are met for such dispensing to cease.

US Patent:

D3740641, Sep 24, 1996

Filed:

Sep 14, 1995

Appl. No.:

D/044010

Inventors:

Diane M. Brancazio - Cambridge MA
Susannah E. Gardner - Brookline MA
Matthew D. Hern - Boston MA
Francis M. Labrano - Narragansett RI
David A. Snow - Barrington RI
David M. Sykes - Cambridge MA

Assignee:

Fountainhead Technologies - Providence RI

US Classification:

D23209

US Patent:

D3727602, Aug 13, 1996

Filed:

Sep 14, 1995

Appl. No.:

D/044002

Inventors:

Diane M. Brancazio - Cambridge MA
Susannah E. Gardner - Brookline MA
Matthew D. Hern - Boston MA
Francis M. Lubrano - Narragansett RI
David A. Snow - Barrington RI
David M. Sykes - Cambridge MA

Assignee:

Fountainhead Technologies - Providence RI

US Classification:

D23209

US Patent:

D3740633, Sep 24, 1996

Filed:

Apr 25, 1995

Appl. No.:

D/037955

Inventors:

Diane M. Brancazio - Cambridge MA
Susannah E. Gardner - Brookline MA
Matthew D. Hern - Boston MA
Francis M. Lubrano - Narragansett RI
David A. Snow - Barrington RI
David M. Sykes - Cambridge MA

Assignee:

Fountainhead Technologies - Providence RI

US Classification:

D23209