Alex T Bailey

Author:

Alex Bailey

ISBN #:

0723258635

US Patent:

6673181, Jan 6, 2004

Filed:

Oct 29, 2001

Appl. No.:

09/984317

Inventors:

Cynthia W. Berry - Pasadena MD
Deborah P. Partlow - Crownsville MD
Alex E. Bailey - Hampstead MD

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

B32B 3126

US Classification:

156 8912, 156182, 156252, 156253, 156256, 156257

Abstract:

A fabrication process for ferrite toroids which utilizes ferrite ceramic tape having an improved elongation characteristic. The process utilizes a set of rigid mandrels which are employed in the final lamination to support the rectangular cross section of the internal cavity of a respective ferrite tube, thereby reducing stress concentration and permitting the highest lamination pressure to be used in the final step. The mandrels are removed prior to panel densification. The tape and mandrels operate together to minimize cracks and pores in the toroids and provide an added advantage of maintaining high tolerances in the internal cavity dimensions as well as the cavity-to-cavity alignment.

US Patent:

7127809, Oct 31, 2006

Filed:

Mar 18, 2004

Appl. No.:

10/802746

Inventors:

Cynthia W. Berry - Pasadena MD, US
Alex E. Bailey - Hampstead MD, US
Robert Fisher - Westminster MD, US
Tapan K. Gupta - Ellicott City MD, US
Daniel Brosey - Finksburg MD, US
Steve M. Smalley - Columbia MD, US
William A. Thomas - Randallstown MD, US

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

H05K 3/30

US Classification:

29832, 29840, 29851, 156 8912, 174259, 361830

Abstract:

An LTCC module includes a base on one or more surfaces for receiving one or more external components to be attached to the module. A base is formed of a plurality of layers of metallization in a predetermined pattern. The layers include an adhesion layer on the LTCC module surface, with one or more intermediate layers, followed by a top layer. The module is fired with each application of the layers at a reduced temperature lower than the normal cofiring temperature of the LTCC module, but of sufficient value to partially sinter the layers. After the last applied top layer, the module is fired once at an elevated temperature to fully sinter the layers.

US Patent:

7240424, Jul 10, 2007

Filed:

Aug 23, 2004

Appl. No.:

10/922850

Inventors:

Cynthia W. Berry - Pasadena MD, US
Alex E. Bailey - Hampstead MD, US

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

H05K 3/36
B32B 37/02

US Classification:

29830, 156182, 156256, 156312

Abstract:

A method of forming an LTCC structure having at least one open cavity on each of first and second opposing sides is disclosed that includes the steps of forming a first LTCC structure including a first side having a plurality of cavities and a second side, subjecting the first LTCC structure to a first pressure, forming a second LTCC structure including a first side having a plurality of cavities and a second side, subjecting the second LTCC structure to a second pressure, arranging the first LTCC structure and the second LTCC structure such that the first LTCC structure second side faces the second LTCC structure second side, and subjecting the placed-together first and second LTCC structures to a third pressure to join the first LTCC structure to the second LTCC structure. A product formed by the subject method is also disclosed.

US Patent:

7244331, Jul 17, 2007

Filed:

Oct 7, 2004

Appl. No.:

10/959121

Inventors:

Cynthia W. Berry - Pasadena MD, US
Alex E. Bailey - Hampstead MD, US
Tapan K. Gupta - Ellicott City MD, US

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

B32B 37/10
B32B 38/00

US Classification:

156289, 156 8911, 156 8912

Abstract:

A method of producing an LTCC substrate having improved cavity bondability is disclosed that involves providing a stack of green ceramic tape sheets having a cavity, placing a template having an opening corresponding to the cavity over the stack, placing a stretchable sheet of material coated with graphite or zinc stearate over the template, isostatically laminating the stack to produce an LTCC substrate having a cavity, and removing the template and sheet of stretchable material from the stack.

US Patent:

7820490, Oct 26, 2010

Filed:

Jun 12, 2006

Appl. No.:

11/450417

Inventors:

Cynthia W. Berry - Pasadena MD, US
Alex E. Bailey - Hampstead MD, US

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

H01L 29/74

US Classification:

438125, 257E2316

Abstract:

An LTCC (low temperature cofired ceramic) structure which has conductors to which leads are to be bonded for connection to external circuitry. The conductors include additives to promote adhesion to the ceramic layer. The presence of these additives degrade bonding performance. For better bondability of the leads, a pure conductor metal layer, devoid of the additives is placed on the conductors in areas where leads are to be bonded. This pure conductor metal layer may be cofired with the stack of ceramic layers or may be post fired after stack firing.

US Patent:

20050189630, Sep 1, 2005

Filed:

Feb 26, 2004

Appl. No.:

10/786125

Inventors:

Cynthia Berry - Pasadena MD, US
Alex Bailey - Hampstead MD, US

International Classification:

H01L023/02

US Classification:

257678000

Abstract:

An LTCC (low temperature cofired ceramic) structure which has conductors to which leads are to be bonded for connection to external circuitry. The conductors include additives to promote adhesion to the ceramic layer. The presence of these additives degrade bonding performance. For better bondability of the leads, a pure conductor metal layer, devoid of the additives is placed on the conductors in areas where leads are to be bonded. This pure conductor metal layer may be cofired with the stack of ceramic layers or may be post fired after stack firing.

US Patent:

57442320, Apr 28, 1998

Filed:

Jul 11, 1996

Appl. No.:

8/680260

Inventors:

Alex Bailey - Hampstead MD
Andrew J. Piloto - Columbia MD
Deborah P. Partlow - Export PA

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

B23B 516

US Classification:

428323

Abstract:

A thick film metallization compatible with low temperature cofired ceramics (LTCC) that displays very low microwave insertion losses commensurate with those of thin film gold. However, the disclosed metallization is applied similar to conventional metallizations by screen printing and has no limit to the number of layers achievable. The electrical performance of the metallization is attained by using a spherical metal particle shape and uniform particle size distribution in the thick film paste. The advantage of this invention is that superior microwave performance can be achieved in electronic packages without the cost and limitations imposed by thin film metallization techniques.

US Patent:

53372093, Aug 9, 1994

Filed:

Sep 10, 1992

Appl. No.:

7/943357

Inventors:

Audrey E. Sutherland - Eldersburg MD
Keith Bridger - Washington DC
Eric M. Fiore - Bel Air MD
Julie A. Christodoulou - Baltimore MD
Alex E. Bailey - Hampstead MD
Allan S. Gelb - Baltimore MD

Assignee:

Martin Marietta Corporation - Bethesda MD

International Classification:

H01G 412
C04B 3546

US Classification:

3613215

Abstract:

A dielectric ceramic composition is disclosed comprising lead magnesium niobate and strontium titanate, barium titanate or a combination thereof. Dopants such as Ta, La, Y, Eu, Nd, Sm, Gd, W, Si, Zr and Sb may also be included in the composition. The lead magnesium niobate with strontium titanate and/or barium titanate composition has been found to possess extremely favorable properties such as high dielectric constant, low dielectric loss, high breakdown strength, low field-induced strain, high electrical resistivity and exceptionally high energy storage capacity. A process is also disclosed for the production of dielectric ceramic materials which includes the use of hot isostatic pressing in an oxygen-containing atmosphere. The disclosed dielectric compositions are useful in capacitors for many applications, including medical devices such as defibrillators and pacemakers.