Katherine A Gudgel

US Patent:

20070199348, Aug 30, 2007

Filed:

Jan 26, 2007

Appl. No.:

11/698936

Inventors:

Katherine Gudgel - Evanston IL, US
Peter Blaum - Bodenheim, DE
Mark Davis - Clarks Summit PA, US
Paula Vullo - Pittston PA, US

International Classification:

C03C 10/00
C03B 27/012
C03B 32/00

US Classification:

065033100

Abstract:

A method of preparing a textured glass ceramic is disclosed which comprises the steps of preparing a precursor glass, preparing a precursor glass body, placing the precursor glass body in a furnace in contact with a brick body having a larger or smaller thermal capacity than formed by the precursor glass body, and ceraming the precursor glass body within the furnace in contact with the brick body thereby effecting a temperature gradient across the precursor glass body for precipitating crystallites having a preferred direction of orientation.

US Patent:

20070203011, Aug 30, 2007

Filed:

Jan 29, 2007

Appl. No.:

11/699442

Inventors:

Katherine Gudgel - Evanston IL, US
Peter Blaum - Bodenheim, DE
Mark Davis - Clarks Summit PA, US
Paula Vullo - Pittston PA, US

International Classification:

H01L 41/18
C03C 10/00
C03C 10/14
C03C 10/04
C03C 10/02

US Classification:

501002000, 25206290R, 501010000, 501005000, 501004000, 501065000, 501032000, 065033100

Abstract:

A translucent piezoelectric glass ceramic is disclosed. The glass ceramic is prepared from a precursor glass by a ceraming process, using a temperature gradient to effect the precipitation of non-ferroelectric piezo-active crystallites from the precursor glass with a preferred direction of orientation and having an average crystal size of less than 1 micrometer. Alternatively, a translucent piezoelectric glass ceramic comprising ferroelectric crystallites may be prepared by poling. In this case the crystal size is controlled to be smaller than 90 nanometers but preferably larger than 10 nanometers.

US Patent:

20070208509, Sep 6, 2007

Filed:

Feb 13, 2007

Appl. No.:

11/705885

Inventors:

Mark Davis - Clarks Summit PA, US
Katherine Gudgel - Evanston IL, US
Peter Blaum - Budenheim, DE
Paula Vullo - Pittston PA, US

International Classification:

G06F 19/00

US Classification:

702001000

Abstract:

A method of selecting poling parameters for poling a glass ceramic body comprising ferroelectric domains, by applying an electric field across the glass ceramic body at a certain poling temperature for a certain poling time comprises the steps of: determining an upper bound of poling temperature given by the maximum poling temperature at which uncontrolled heat-up (thermal runaway) is avoided; and selecting the poling temperature to be smaller than the upper bound, preferably close to the upper bound.