Michael R Mohr

US Patent:

51190281, Jun 2, 1992

Filed:

Apr 26, 1990

Appl. No.:

7/514618

Inventors:

John J. Mooney - Bethpage NY
Christopher J. Witt - Laurel Hollow NY
Michael T. Mohr - New Port Richey FL

Assignee:

Grumman Aerospace Corporation - Bethpage NY

International Classification:

G01V 308
G01V 3165
G01V 338

US Classification:

324326

Abstract:

A method and system for determining the depth of an electrically conductive body in a medium having a known conductivity and a known permeability. The method comprises the steps of generating a primary magnetic field having a time-varying field strength, and transmitting that primary magnetic field into the medium. The primary magnetic field induces an electric current in the conductive body, and this electric current generates a secondary magnetic field that also has a time-varying field strength and that propagates outward from the conductive body and through the medium. The method of this invention further includes the steps of sensing the strength of that secondary magnetic field, comparing the primary and secondary magnetic fields to measure the phase difference therebetween, and then calculating the depth of the conductive body in the medium from the detected phase difference.

US Patent:

6020544, Feb 1, 2000

Filed:

Jun 12, 1998

Appl. No.:

9/097207

Inventors:

Marvin S. Jones - Port Washington NY
Peter M. Barna - Yonkers NY
William S. Youse - Hewlett NY
Anthony C. Arena - Forest Hills NY
Michael Mohr - Huntington NY

Assignee:

Steinway, Inc. - Waltham MA

International Classification:

G10C 300

US Classification:

84218

Abstract:

A piano includes an underlever assembly having an underlever arm and an underlever support joining the underlever arm to a string damper. The underlever arm is mounted to move between an at-rest position and a second position. A latch is mounted to a latch mount for movement between non-latching and latching positions. In latching position, the latch engages a latch surface of the underlever support to maintain the string damper spaced from a corresponding piano string. A stop mounted to the latch mount limits movement of the underlever arm toward its second position. A method for controlling a piano string damper includes contacting the underlever arm with the latch to maintain the string damper spaced from the string, and contacting the underlever arm with the stop to limit movement of the underlever arm.