Steve A Berg

US Patent:

7012386, Mar 14, 2006

Filed:

Oct 22, 2004

Appl. No.:

10/971653

Inventors:

Steve W. Berg - Villa Park IL, US
George A. Goeppner - Orland Park IL, US
Arthur E. Grelick - Barrington IL, US
John Hoyt - Woodridge IL, US
Yoon W. Kang - Knoxville TN, US
Wayne Michalek - Plainfield IL, US
Terry L. Smith - Plainfield IL, US
William Yoder - Romeoville IL, US

Assignee:

The University of Chicago - Chicago IL

International Classification:

H01J 23/00

US Classification:

315505, 315 541, 315506

Abstract:

An RF window and a method of manufacture of the RF window are provided. The RF window of the invention has very low reflected RF power. The RF window includes a center sleeve assembly including a ceramic disc mounted within a copper sleeve. The ceramic disc has opposed surfaces, a ceramic surface coating is applied to each of the opposed surfaces. The ceramic surface coatings are selected for a particular application of the RF window. A pair of end assemblies is removably assembled with the center sleeve assembly. An end assembly mating face is arranged for adjustable slip fit engagement within the copper sleeve of the center sleeve assembly to define a respective cavity on opposed sides of the ceramic disc with the mating face positioned at an adjusted position. An intermediary ring is fixedly secured to the end assembly with the mating face at the adjusted position.

US Patent:

61685542, Jan 2, 2001

Filed:

Dec 23, 1997

Appl. No.:

8/997286

Inventors:

Steve W. Berg - Villa Park IL
Ralph Swanson - Downers Grove IL

International Classification:

A63B 2200

US Classification:

482 70

Abstract:

An attachment is provided for interchangeably converting a ski simulating machine into a rowing machine, the ski simulating machine having a frame, a pair of skis slidably mounted on the frame to move in forward and rearward directions on the frame and means mounted on the frame for providing resistance to the pair of skis during at least one of forward and rearward movement. The attachment includes a seat mounted for guided sliding movement with respect to the frame, foot support means mounted on the frame for bracing a user's feet when the user is sitting on the seat, and means for coupling the resistance providing means for application to a user's arm movement during a rowing exercise.