Michael W Weber

US Patent:

6351011, Feb 26, 2002

Filed:

Jan 12, 2000

Appl. No.:

09/481927

Inventors:

Stephen J. Whitney - Lake Zurich IL
Jeffrey S. Niew - Burr Ridge IL
Michael J. Weber - Wheeling IL

Assignee:

Littlefuse, Inc. - Desplaines IL

International Classification:

H01L 2362

US Classification:

257355, 257787, 257659

Abstract:

A number of integrated circuit dies having on board protection against electrical overstress (EOS) transients are provided. Generally, the devices have an integrated circuit die with an outer periphery and a functional die area. A plurality of conductive input/output pads are formed on the integrated circuit die. Typically, a first conductive guard rail is disposed on the integrated circuit die and forms a gap between each one of the input/output pads. A voltage variable material is disposed in the gaps between the conductive guard rail and the input/output pads. Typically, a plurality of electrical leads are electrically connected to a respective one of the plurality of conductive input/output pads. At normal operating voltages, the voltage variable material is non-conductive. However, in response to an EOS transient, the voltage variable material switches to a low resistance state, providing a conductive path between the conductive guard rail and the input/output pads.

US Patent:

6582647, Jun 24, 2003

Filed:

Sep 30, 1999

Appl. No.:

09/408645

Inventors:

Tom J. Hall - Arlington Heights IL
Michael J. Weber - Arlington Heights IL

Assignee:

Littelfuse, Inc. - Des Plaines IL

International Classification:

B29C 7100

US Classification:

264345, 264340

Abstract:

The present invention provides a method for heat treating a polymer PTC composition to increase the peak resistivity of the composition making it especially well suited for high voltage applications. A polymer PTC composition having a melting point temperature T is provided. The temperature of the polymer PTC composition is increased at a rate, r , to a temperature greater than T. The temperature of polymer PTC composition is held at the temperature greater than T for a predetermined period of time. Then the temperature of the polymer PTC composition is decreased to a temperature less than T at a rate, r , wherein r is greater than r.

US Patent:

8225912, Jul 24, 2012

Filed:

Jun 6, 2008

Appl. No.:

12/157037

Inventors:

John A. Dalman - Elburn IL, US
Michael A. Weber - Gurnee IL, US

Assignee:

Miner Enterprises, Inc. - Geneva IL
Powerbrace Corporation - Kenosha WI

International Classification:

B61H 13/36

US Classification:

1882291, 1882296

Abstract:

A method of manufacturing a railroad freight car brake beam strut assembly including the steps of: providing a railroad freight car brake beam strut having an axially aligned slot defined between first and second sides of the strut, with each side of the strut defining a bore opening to the slot and to an exterior of the strut, with the bores defined by the strut being aligned relative to each other along an axis extending generally normal to a longitudinal axis of the strut. The methodology of the present disclosure further includes the step of: pressing a brake pin bushing into each bore of the strut in a direction extending away from the longitudinal axis of the strut. A railroad freight car strut assembly is also disclosed.

US Patent:

8602181, Dec 10, 2013

Filed:

Jun 13, 2012

Appl. No.:

13/495578

Inventors:

John A. Dalman - Elburn IL, US
Michael A. Weber - Gurnee IL, US

Assignee:

Miner Enterprises, Inc. - Geneva IL
Powerbrace Corporation - Kenosha WI

International Classification:

B61H 13/36

US Classification:

1882291, 1882296

Abstract:

A method of manufacturing a railroad freight car brake beam strut assembly including the steps of: providing a railroad strut having an elongated slot defined between first and second sides of the strut, with each side of the strut defining a bore opening to the slot and to an exterior of the strut. The bores defined by the strut are aligned relative to each other along an axis. The methodology of the present disclosure further includes the step of: pressing a brake pin bushing into each bore of the strut in a direction extending away from the longitudinal axis of the strut with each brake pin bushing having first and second ends, and wherein a periphery of each bushing has a frusto-conical surface configuration. A railroad freight car strut assembly is also disclosed.

US Patent:

59409584, Aug 24, 1999

Filed:

May 29, 1996

Appl. No.:

8/654528

Inventors:

Philip C. Shaw - Elk Grove Village IL
Donna L. Randle - Chicago IL
Michael J. Weber - Arlington Heights IL
Michael J. Hoss - Des Plaines IL
Tom J. Hall - Arlington Heights IL

Assignee:

Littlefuse, Inc. - Des Plaines IL

International Classification:

H01C 702
H01R 4302

US Classification:

29612

Abstract:

Electrical devices comprising a PTC element comprised of a polymer having conductive particles dispersed therein. The PTC element is coated with a conductive layer and has electrodes with a plurality of voids affixed to opposing surfaces. The devices are made by dispersing conductive particles into a polymer to form a polymer PTC composition. The polymer PTC composition is melt-shaped to form a laminar shaped PTC element. First and second opposing surfaces of the PTC element are coated with a conductive layer. The electrodes, characterized by a plurality of voids, are brought into contact with the coated surfaces of the PTC element, and heated while applying pressure to form a laminate. The laminate is then further shaped into a plurality of PTC electrical circuit protection devices.

US Patent:

59559365, Sep 21, 1999

Filed:

May 20, 1997

Appl. No.:

8/859624

Inventors:

Philip C. Shaw - Elk Grove Village IL
Donna L. Randle - Chicago IL
Michael J. Weber - Arlington Heights IL
Michael J. Hoss - Des Plaines IL
Tom J. Hall - Arlington Heights IL

Assignee:

Littlefuse, Inc. - Des Plaines IL

International Classification:

H01C 710

US Classification:

338 22R

Abstract:

Electrical devices having a PTC element of a polymer having conductive particles dispersed therein. The PTC element is coated with a conductive layer and has electrodes with a plurality of voids affixed to opposing surfaces. The devices are made by dispersing conductive particles into a polymer to form a polymer PTC composition. The polymer PTC composition is melt-shaped to form a laminar shaped PTC element. First and second opposing surfaces of the PTC element are coated with a conductive layer. The electrodes, characterized by a plurality of voids and made of foam, are brought into contact with the coated surfaces of the PTC element, and heated while applying pressure to form a laminate. The laminate is then further shaped into a plurality of PTC electrical circuit protection devices.