Don Y Lee

US Patent:

D517608, Mar 21, 2006

Filed:

Nov 17, 2004

Appl. No.:

29/217477

Inventors:

Stephen H. Wolff - New Rochelle NY, US
Don Lee - New Rochelle NY, US

Assignee:

Wolff Medical Marketing and Design, LLC - New Rochelle NY

International Classification:

1902

US Classification:

D19 86

US Patent:

D551348, Sep 18, 2007

Filed:

Jul 20, 2005

Appl. No.:

29/234604

Inventors:

Don Lee - New Rochelle NY, US

Assignee:

Wolff Medical Marketing and Design, LLC - New Rochelle NY

International Classification:

2401

US Classification:

D24165, D24134

US Patent:

D566536, Apr 15, 2008

Filed:

Nov 17, 2004

Appl. No.:

29/217467

Inventors:

Stephen H. Wolff - New Rochelle NY, US
Don Lee - New Rochelle NY, US

Assignee:

Wolff Medical Marketing and Design, LLC - New York NY

International Classification:

0808

US Classification:

D 8395

US Patent:

D576324, Sep 2, 2008

Filed:

Mar 19, 2007

Appl. No.:

29/285035

Inventors:

Stephen H. Wolff - Scarsdale NY, US
Don Lee - New Rochelle NY, US

Assignee:

Wolff Medical Marketing and Design, LLC - New York NY

International Classification:

2602

US Classification:

D26 39

US Patent:

D603706, Nov 10, 2009

Filed:

Jul 25, 2008

Appl. No.:

29/310121

Inventors:

Stephen Wolff - New York NY, US
Don Lee - New City NY, US

International Classification:

0901

US Classification:

D 9500

US Patent:

52456544, Sep 14, 1993

Filed:

Oct 10, 1991

Appl. No.:

7/775628

Inventors:

Dennis E. Wilkison - San Jose CA
Don N. Lee - San Jose CA

Assignee:

Cermetek Microelectronics, Inc. - Sunnyvale CA

International Classification:

H02H 322

US Classification:

379405

Abstract:

An isolation circuit (20) that is devoid of coupling transformers and yet suitable for use as a telephone line interface. The circuit is characterized by very wide bandwidth, low noise, and high linearity. Opto-isolators couple analog transmit and receive channels in a user device (12) across an isolation barrier (57) to a line pair for full duplex communication on the line pair. The interface circuit, which also includes a hybrid (55), includes first and second oppositely directed linear optocouplers (50,52). The first is disposed between the transmit channel and the hybrid; the second between the receive channel and the hybrid.

US Patent:

53572114, Oct 18, 1994

Filed:

May 3, 1993

Appl. No.:

8/056093

Inventors:

Stephen W. Bryson - Cupertino CA
Alan T. Kondo - Cupertino CA
Don N. Lee - San Jose CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H03F 326

US Classification:

330263

Abstract:

A pin driver amplifier having a complementary pair of transistors with a pair of resistors coupled between the respective emitters. A node between the resistors is coupled through an output series resistor to an output terminal adapted for connection of a transmission line that conducts driver pulses of predetermined voltage levels and timing to a device under test. A capacitor is tied between the emitters to provide a substantially constant reverse termination impedance for the transmission line thereby reducing reflections. Also, an RC network is coupled between the output terminal and ground to further reduce reflections. The amplifier transistors are driven by respective buffer transistor emitters that are tied together by a capacitor to make the positive and negative going drive capabilities for the amplifier transistors more equal. Further, capacitors are coupled between the amplifier collectors and ground to provide a bypass for parasitic inductance in the supply voltage wires.

US Patent:

53772024, Dec 27, 1994

Filed:

May 3, 1993

Appl. No.:

8/056097

Inventors:

Stephen W. Bryson - Cupertino CA
Alan T. Kondo - Cupertino CA
Don N. Lee - San Jose CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

G05B 2302
G01R 1508

US Classification:

371 27

Abstract:

A test equipment pin driver having a main output channel including a pulse forming circuit, a buffer and an output amplifier connected in series. The pulse forming circuit provides pulses that are timed to a data input signal, and the buffer passes the pulses to the amplifier which produces driver pulses adapted to be transmitted to a device under test. The high and low voltage levels of the driver pulses are made substantially the same as programmed high and low voltages by providing scaled replicas of the buffer and amplifier, and using closed loop compensation to accurately drive the replica outputs to the high and low programmed voltages, respectively. The replicas mirror the DC performance of the buffer and amplifier of the main output channel, and clamping voltages are provided from the closed loops to enable operation of the main output channel in a manner that produces driver pulses with the programmed high and low voltage levels.