Rudolf E Rehquate

US Patent:

6759909, Jul 6, 2004

Filed:

Jun 21, 2002

Appl. No.:

10/064217

Inventors:

James Edward Hughes - Apex NC
Rudolf Eugene Rehquate - Raleigh NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H03L 707

US Classification:

331 2, 331 46, 713500, 327551

Abstract:

A cluster of processing systems wherein each system is set to operate at a unique operating frequency. Each unique frequency is set to differ from each other by at least a predetermined frequency differential or bandwidth. When clustered, the radiated emissions will not add. Rather, the RF energy is distributed over the predetermined frequency bandwidth and in so doing achieve a reduction of measured RF energy at any singular frequency. By using RF energy dispersal in aggregate systems, the need for special or additional RF shielding is precluded. Current design and manufacturing techniques can continue to be used. Thus, reducing the overall cost of implementing aggregated systems.

US Patent:

7005926, Feb 28, 2006

Filed:

May 19, 2004

Appl. No.:

10/848794

Inventors:

James Edward Hughes - Apex NC, US
Rudolf Eugene Rehquate - Raleigh NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H03L 7/07

US Classification:

331 2, 331 46

Abstract:

A cluster of processing systems is provided wherein each processing system is set to operate at a unique operating frequency. Each unique frequency is set to differ from each other by at least a predetermined frequency differential or bandwidth. When clustered, the radiated emissions will not add. Rather, the RF energy is distributed over the predetermined frequency bandwidth and in so doing achieve a reduction of measured RF energy at any singular frequency. By using RF energy dispersal in systems consisting of aggregated processing elements as subsystems, the need for special or additional RF shielding is precluded. Current design and manufacturing techniques can continue to be used. Thus, reducing the overall cost of implementing aggregated systems.

US Patent:

8485834, Jul 16, 2013

Filed:

May 12, 2011

Appl. No.:

13/106030

Inventors:

Edward J. Bodette - Cary NC, US
Michael H. Crowder - Cary NC, US
Rudolf E. Rehquate - Raleigh NC, US
Edward S. Suffern - Chapel Hill NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H01R 4/58

US Classification:

439 88

Abstract:

A system and method for mitigating EMI in an electronic device rely on a set of foam dummy plugs specially configured for insertion into socket connectors according to connector type. The foam plugs have no electrical terminals or wiring, but are made from a foam composite material that attenuates electromagnetic radiation by absorption. The foam composite material includes a foam matrix and electrically conductive particles impregnated within the foam matrix. A handle may be unitarily formed with the foam plug. The handle may include a stamped through-hole, forming a ring, to facilitate insertion and removal of the dummy plugs by hand.

US Patent:

8502618, Aug 6, 2013

Filed:

Dec 12, 2008

Appl. No.:

12/334050

Inventors:

Edward J. Bodette - Cary NC, US
Michael Crowder - Cary NC, US
Rudolf Rehquate - Raleigh NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04B 3/30

US Classification:

333 12, 333 171, 333185

Abstract:

The average EMR emissions of an electronic device may be reduced by implementing an electrically-active modulated termination. For example, the impedance may be continuously varied at one or more termination locations between two metal substructures to cause a like variation in the amplitude of each component of the EMR. According to one approach, cyclically varying the electrical impedance with a period of less than the time interval over which the EMR is measured will result in a reduction in the average measured EMR.

US Patent:

20070275588, Nov 29, 2007

Filed:

May 29, 2006

Appl. No.:

11/420775

Inventors:

Edward J. Bodette - Cary NC, US
Michael H. Crowder - Cary NC, US
Rudolf E. Rehquate - Raleigh NC, US
Carl D. Susinno - Raleigh NC, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H01R 13/625

US Classification:

439341

Abstract:

An isolated signal probe comprises an input module, an output module, and a fiber optic line connecting the input module to the output module. The input module includes external positive and negative terminals, an input translation circuit electrically connected to the external positive and negative terminals, a first power supply for driving the input translation circuit, and an electrical-to-optical converter that receives a first signal from the input translation circuit. The output module includes an optical-to-electrical converter, an output translation circuit for receiving a second signal from the optical-to-electrical converter; a second power source for driving the output translation circuit, and an output connector electrically connected to the output translation circuit. The fiber optic line connects the electrical-to-optical converter to the optical-to-electrical converter.

US Patent:

20130212867, Aug 22, 2013

Filed:

Mar 21, 2013

Appl. No.:

13/848275

Inventors:

INTERNATIONAL BUSINESS MACHINES CORPORATION - , US
Michael H. Crowder - Cary NC, US
Rudolf E. Rehquate - Raleigh NC, US
Edward S. Suffern - Chapel Hill NC, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

H05K 9/00
H01R 43/20

US Classification:

295921

Abstract:

A method of mitigating EMI in an electronic device includes selecting a subset of surface-mount socket connectors on an electronic device to be connected with corresponding working plug connectors and connecting the working plug connectors with the selected subset of socket connectors by inserting the working plug connectors into the selected subset of socket connectors. The method further includes positioning a dummy plug in each of the unselected surface-mount socket connectors, the dummy plug comprising a flexible foam material configured to attenuate electromagnetic radiation by absorption and having a dummy plug profile generally matched to a socket profile of the corresponding socket connector.

US Patent:

61952664, Feb 27, 2001

Filed:

Mar 31, 1999

Appl. No.:

9/282838

Inventors:

Russell S. Padgett - Cary NC
William D. Owsley - Durham NC
Rudolf E. Rehquate - Raleigh NC
Daniel J. Hunt - Cary NC
Edward N. Dials - Apex NC
A. Lamond Hodges - Creedmoor NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H05R 900

US Classification:

361799

Abstract:

A slot-type processor and one or more cache modules are incorporated into a vertically oriented, multiple chip module (CM) that is mounted to a printed circuit board. The MCM operates at ultra high frequencies and very high temperatures. Each component of the MCM has a heatsink, a thermal plate, and a series of mounting clips and screws which combine to dissipate heat. The heatsinks and thermal plates generate most of the electromagnetic interference (EMI) since they are not attached or grounded to the board. A series of alignment posts extend from the board and are used to individually and slidably mount each of the components to the board. Each thermal plate is grounded to the posts with grounding clips. The clips maintain contact with the thermal plate through wiping elements. Additional pressure is applied to the wiping elements through a post retaining bracket.

US Patent:

56803974, Oct 21, 1997

Filed:

Mar 13, 1995

Appl. No.:

8/402740

Inventors:

Kenneth J. Christensen - Apex NC
Francis E. Noel - Durham NC
Rudolf E. Rehquate - Raleigh NC
Thomas Stammely - Cary NC
Jerry Dagher - Raleigh NC
Beymer Bevill - Fuquay-Varina NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L 1216
H04L 1244

US Classification:

370421

Abstract:

A multi-port LAN switch is provided that enables attached network devices to both communicate directly and to insert into a token-ring network through an attached concentrator. Each port of the multi-port LAN switch has a first transformer, a second transformer, and a switching system. The first transformer has a first winding connected to a first connection of the port. The second transformer has a first winding connected to a second connection of the port. The switching system switches to a port mode or an adapter mode as a function of a mode signal transmitted to the port. In the adapter mode, the switching system connects a second winding of the first transformer to a transmitter circuit in the port, and its connects a second winding of the second transformer to a receiver circuit in the port. In the port mode, the switching system connects the second winding of the first transformer to the receiver circuit in the port, and it connects the second winding of the second transformer to the transmitter circuit in the port. Each port of the multi-port LAN switch further includes a DC voltage source that is switchably connected to the first connection of the port through a first switch.