Stephen A Ezzell

US Patent:

6383578, May 7, 2002

Filed:

Apr 3, 2001

Appl. No.:

09/825562

Inventors:

Stephen A. Ezzell - Woodbury MN
Hassan Sahouani - Hastings MN
Ernest L. Thurber - Woodbury MN

Assignee:

3M Innovative Properties Co. - St. Paul MN

International Classification:

G02F 1335

US Classification:

428 11, 428 12, 428 126, 4284735, 349 1, 349182, 349193, 528170, 528353

Abstract:

An angularity enhancement layer in a liquid crystal display, which display comprises a liquid crystal cell, wherein the angularity enhancement layer includes a negative birefringent polyimide layer comprising a plurality of structural units having pendant fluorene groups, said angularity enhancement layer being disposed on at least one surface of said liquid crystal cell. A liquid crystal display can comprise an angularity enhancement construction of the invention which comprises a polyimide layer.

US Patent:

6392004, May 21, 2002

Filed:

Aug 21, 2000

Appl. No.:

09/642849

Inventors:

Bert T. Chien - Minneapolis MN
Stephen A. Ezzell - Woodbury MN

Assignee:

3M Innovative Properties Company - Saint Paul MN

International Classification:

C08G 7310

US Classification:

528170, 528128, 528172, 528173, 528176, 528183, 528185, 528220, 528229, 528353, 528125, 343700 R, 343785, 343911 R, 385129, 385130, 385141, 385145, 428 11, 428 126, 4284735, 428901

Abstract:

An element of a gigahertz electronic device is provided comprising a polyimide selected to have an imide equivalent weight of 375 or greater. The polyimide preferably has a dielectric loss at 12. 8 GHz of 0. 009 or less and a Tg of 260Â C. or greater. Such elements include circuit substrates and antennas.

US Patent:

6417321, Jul 9, 2002

Filed:

Aug 21, 2000

Appl. No.:

09/642724

Inventors:

Kazuhiko Minami - Sagamihara, JP
Hiroshi Ayukawa - Sagamihara, JP
Toshihiro Suwa - Sagamihara, JP
Mitsuaki Kobayashi - Hino, JP
Bert T. Chien - Minneapolis MN
Stephen A. Ezzell - Woodbury MN

Assignee:

3M Innovative Properties Company - Saint Paul MN

International Classification:

C08G 7310

US Classification:

528353, 528125, 528128, 528170, 528172, 528173, 528176, 528183, 528185, 528220, 528229, 428 11, 428 126, 4284735, 428901, 385129, 385130, 385141, 385145, 343700 R, 343785, 343911 R

Abstract:

A thermally cured polyimide is provided, and in particular a crosslinked polyimide, comprising a fluorenyl diamine and comprising an aromatic ring having at least one C1-C10 branched or unbranched alkyl substituent, where the alkyl substituent includes a benzylic hydrogen. The present invention provides a crosslinked polyimide made by a process comprising the step of crosslinking a polyimide comprising diamines comprising pendent fluorenyl groups and comprising aromatic rings having at least one C1-C10 branched or unbranched alkyl substituent, the alkyl substituent including a benzylic hydrogen, by raising the temperature of said polyimide above its glass transition temperature.

US Patent:

20020192445, Dec 19, 2002

Filed:

May 3, 2001

Appl. No.:

09/848029

Inventors:

Stephen Ezzell - Woodbury MN, US
Robert Moshrefzadeh - Oakdale MN, US
Elisa Cross - Woodbury MN, US
Bert Chien - Minneapolis MN, US
Mitsuaki Kobayashi - Tokyo, JP
Hiroshi Ayukawa - Kanagawa, JP

International Classification:

B32B007/02
B32B001/00

US Classification:

428/212000, 428/332000

Abstract:

Components for electronic displays containing a polyimide substrate and an electrical conductor are disclosed. The components are suitable for use in touch panel displays. The invention is also directed to electronic displays incorporating the components of the invention, and methods of making the display components. The combined polyimide substrate and electrical conductor are selected such that they have high internal radiation transmissivity, and typically have an effective radiation absorption coefficient of less than 0.02 per micron at wavelengths from 400 to 450 nm. In addition, the polyimide substrate permits processing of the display components at elevated temperatures, and usually has a glass transition temperature greater than 300 C.

US Patent:

62387537, May 29, 2001

Filed:

Mar 23, 2000

Appl. No.:

9/534148

Inventors:

Stephen A. Ezzell - Woodbury MN
Hassan Sahouani - Hastings MN
Ernest L. Thurber - Woodbury MN

Assignee:

3M Innovative Properties Company - Saint Paul MN

International Classification:

G02F 11335

US Classification:

428 13

Abstract:

An angularity enhancement layer in a liquid crystal display, which display comprises a liquid crystal cell, wherein the angularity enhancement layer includes a negative birefringent polyimide layer comprising a plurality of structural units having pendant fluorene groups, said angularity enhancement layer being disposed on at least one surface of said liquid crystal cell. A liquid crystal display can comprise an angularity enhancement construction of the invention which comprises a polyimide layer.

US Patent:

57445745, Apr 28, 1998

Filed:

Dec 5, 1995

Appl. No.:

8/557086

Inventors:

Stephen A. Ezzell - Woodbury MN
Richard G. Hansen - St. Paul MN
Gregory J. Anderson - Brooklyn Park MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

C08G 6908
C07D30702

US Classification:

528315

Abstract:

Isomaleimides and polyisomaleimides can be prepared by a method comprising the steps in sequence: admixing a maleamic acid or polymaleamic acid with an acid halide, reacting the admixture with a tertiary amine at a temperature sufficiently low to suppress the formation of a maleimide, and isolating the resulting isomaleimide or polyisomaleimide. Polymerization of a polyisomaleimide with a polynucleophilic monomer (polythiol, polyol, polyamine) produces novel polymers.

US Patent:

55021565, Mar 26, 1996

Filed:

Jul 28, 1994

Appl. No.:

8/282849

Inventors:

Anne K. St. Clair - Poquoson VA
Stephen A. Ezzell - Woodbury MN
Larry T. Taylor - Blacksburg VA
Harold G. Boston - Newport News VA

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

C08G 7310
B05D 506
B32B 2700

US Classification:

528353

Abstract:

Disclosed is a thermally-stable SnO. sub. 2 -surfaced polyimide film wherein the electrical conductivity of the SnO. sub. 2 surface is within the range of about 3. times. 10. sup. -3 to about 1. times. 10. sup. -2 ohms. sup. -1,. Also disclosed is a method of preparing this film from a solution containing a polyamic acid and SnCl. sub. 4 (DMSO). sub. 2.

US Patent:

59690887, Oct 19, 1999

Filed:

May 5, 1998

Appl. No.:

9/073335

Inventors:

Stephen A. Ezzell - Woodbury MN
Hassan Sahouani - Hastings MN
Ernest L. Thurber - Woodbury MN

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

C08G 7310
B32B 2700

US Classification:

528353

Abstract:

An angularity enhancement layer in a liquid crystal display, which display comprises a liquid crystal cell, wherein the angularity enhancement layer includes a negative birefringent polyimide layer comprising a plurality of structural units having pendant fluorene groups, said angularity enhancement layer being disposed on at least one surface of said liquid crystal cell. A liquid crystal display can comprise an angularity enhancement construction of the invention which comprises a polyimide layer.