Kenneth W Hang

US Patent:

6776861, Aug 17, 2004

Filed:

Jan 2, 2003

Appl. No.:

10/336439

Inventors:

Carl Baasun Wang - Raleigh NC
Kenneth Warren Hang - Hillsborough NC
Christopher Roderick Stewart Needes - Chapel Hill NC

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 3104

US Classification:

156 8911, 156 8912

Abstract:

The present invention relates to a method to achieve the suppression of planar shrinkage in LTCC ceramic tape laminate structures without externally applied forces or sacrificial constraining tape. The method utilizes a non-sacrificial constraining tape that constrains a tape assembly.

US Patent:

6827800, Dec 7, 2004

Filed:

May 6, 2003

Appl. No.:

10/430081

Inventors:

Carl Baasun Wang - Raleigh NC
Kenneth Warren Hang - Hillsborough NC
Christopher Roderick Stewart Needes - Chapel Hill NC

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 3126

US Classification:

156 8911, 156 8912, 156 8916

Abstract:

A method to produce a distortion-free asymmetrical low-temperature co-fired ceramic structure comprising at least one layer of glass-containing internal constraining tape and at least one layer of glass-containing primary tape wherein the internal constraining tape and the primary tape are laminated to form an asymmetrical laminate and wherein a release layer is deposited on at least one surface of the laminate forming an assembly, wherein the surface is opposite the position of greatest asymmetry of the laminated layers and wherein the assembly is thermally processed producing a structure exhibiting an interactive suppression of x,y shrinkage.

US Patent:

6835682, Dec 28, 2004

Filed:

Mar 17, 2003

Appl. No.:

10/390108

Inventors:

Yong Cho - Apex NC
Kenneth Warren Hang - Hillsborough NC

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C03C 1400

US Classification:

501 32, 501 20, 501 77, 428434

Abstract:

The present invention relates to an alkali-containing magnesium borosilicate glass composition comprising, in mole %, 10-25% SiO , 10-25% B O , 5-10% BaO, 40-65% MgO, 0. 5-3% ZrO , 0. 3-3% P O , and 0. 2-5% M O where M is selected from the group of alkali elements and mixtures thereof. The invention is further directed to a castable dielectric composition comprising a dispersion of finely divided solids comprising, based on solids: (a) 50-90 wt. % the glass composition as described above; (b) 10-50 wt. % ceramic filler; both dispersed in a solution of (c) an organic polymeric binder; and (d) a volatile organic solvent. The invention is still further directed to the castable dielectric composition described above used in a method of forming a high TCE LTCC green tape by casting a thin layer of the castable dispersion onto a flexible substrate and heating the cast layer to remove the volatile organic.

US Patent:

6841493, Jan 11, 2005

Filed:

Mar 17, 2003

Appl. No.:

10/390107

Inventors:

Yong Cho - Apex NC, US
Kenneth Warren Hang - Hillsborough NC, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C03C 1400
C03C 315

US Classification:

501 32, 501 46, 501 47, 501 51, 428434

Abstract:

The present invention is directed to a glass composition comprising, based on mole %, 15-35% MO where M is selected from BaO, CaO, MgO, PbO, SrO and mixtures thereof, 30-60% TiO, 10-30% BO, 1-7% PO, 0-3% LiO and 2-16% LnOwhere Ln is selected from the group of rare earth elements and mixtures thereof. The invention is further directed to the glass composition incorporated in a thick film composition or a castable dielectric composition comprising a dispersion of finely divided solids comprising, based on solids: (a) 30-100 wt. % the glass composition; (b) 0-50 wt. % ceramic filler; both dispersed in a solution of (c) an organic polymeric binder; and (d) a volatile organic solvent. The invention is still further directed to the castable dielectric composition used in a method of forming a high K green tape by casting a thin layer of the castable dispersion onto a flexible sheet and heating the cast layer to remove the volatile organic solvent.

US Patent:

7030048, Apr 18, 2006

Filed:

Aug 5, 2003

Appl. No.:

10/634505

Inventors:

Yong Cho - Cary NC, US
Kenneth Warren Hang - Hillsborough NC, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C03C 3/085
C03C 3/062
C03C 8/14
C03V 4/16

US Classification:

501 69, 501 70, 501 73, 501 17, 501 18, 501 20, 501 32, 428210, 428426

Abstract:

present invention relates to a Cd-free and Pb-free glass composition comprising, based in mol %, 1–10% MO where M is selected from Ba, Sr, Ca and mixtures thereof, 5–30% MgO, 0. 3–5% CuO, 0–2. 5% PO, 0–2. 5% ZrO, 24–45% ZnO, 2–10% AlO, 35–50% SiOand 0. 1–3% AO where A is selected from the group of alkali elements and mixtures thereof wherein the glass composition is useful in thick paste dielectric materials which are compatible with AlN substrates.

US Patent:

7048993, May 23, 2006

Filed:

May 21, 2004

Appl. No.:

10/850878

Inventors:

Carl B. Wang - Raleigh NC, US
Kenneth Warren Hang - Hillsborough NC, US
Christopher R. Needes - Chapel Hill NC, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 3/00

US Classification:

428210, 428633, 361319, 361320, 3613211

Abstract:

A method to produce a distortion-free asymmetrical low-temperature co-fired ceramic structure comprising at least one layer of glass-containing internal constraining tape and at least one layer of glass-containing primary tape wherein the internal constraining tape and the primary tape are laminated to form an asymmetrical laminate and wherein a release layer is deposited on at least one surface of the laminate forming an assembly, wherein the surface is opposite the position of greatest asymmetry of the laminated layers and wherein the assembly is thermally processed producing a structure exhibiting an interactive suppression of x,y shrinkage.

US Patent:

7067026, Jun 27, 2006

Filed:

Nov 22, 2004

Appl. No.:

10/994594

Inventors:

Carl B. Wang - Raleigh NC, US
Kenneth Warren Hang - Hillsborough NC, US
Christopher R. Needes - Chapel Hill NC, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B32B 18/00
B32B 37/16

US Classification:

156 8911, 156 8912, 156 8916, 428210, 3613211

Abstract:

This invention relates to a process which produces flat, distortion-free, zero-shrink, low-temperature co-fired ceramic (LTCC) bodies, composites, modules or packages from precursor green (unfired) laminates of three or more different dielectric tape chemistries that are configured in an uniquely or pseudo-symmetrical arrangement in the z-axis of the laminate.

US Patent:

7068492, Jun 27, 2006

Filed:

Nov 22, 2004

Appl. No.:

10/994423

Inventors:

Carl B. Wang - Raleigh NC, US
Kenneth Warren Hang - Hillsborough NC, US
Christopher R. Needes - Chapel Hill NC, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

H01G 4/06

US Classification:

3613212, 361311, 361322

Abstract:

This invention relates to a process which produces flat, distortion-free, zero-shrink, low-temperature co-fired ceramic (LTCC) bodies, composites, modules or packages from precursor green (unfired) laminates of three or more different dielectric tape chemistries that are configured in an uniquely or pseudo-symmetrical arrangement in the z-axis of the laminate.