Bert T Chien

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:

20020004544, Jan 10, 2002

Filed:

Oct 28, 1999

Appl. No.:

09/428374

Inventors:

BRANT U. KOLB - AFTON MN, US
BERT T. CHIEN - MINNEAPOLIS MN, US

International Classification:

C08L001/00

US Classification:

524/413000

Abstract:

A zirconia sol comprising an aqueous phase having dispersed therein a plurality of single crystal zirconia particles having an average primary particle size less than about 20 nm. The zirconia sols are substantially non associated having a dispersion index ranging from about 1-3 and are highly crystalline exhibiting a crystallinity index of about 0.65 or greater. Of the crystalline phase, about 70% or greater exists in combined cubic and tetragonal crystal lattice structures without a crystal phase stabilizer. Also described is a hydrothermal method of making zirconia sols having substantially non-associated zirconia particles and composite materials made from the zirconia sols.

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:

20050124713, Jun 9, 2005

Filed:

Dec 4, 2003

Appl. No.:

10/727830

Inventors:

Clinton Jones - Somerset WI, US
David Olson - Marine on St. Croix MN, US
Judith Invie - Woodbury MN, US
Olester Benson - Woodbury MN, US
Richard Pokorny - Maplewood MN, US
Scott Kaytor - Woodbury MN, US
Tetsuya Toma - Woodbury MN, US
Scott Tapio - Falcon Heights MN, US
Bert Chien - Minneapolis MN, US
Daniel Hennen - Cottage Grove MN, US
Jung-Sheng Wu - Woodbury MN, US

International Classification:

C08G002/00

US Classification:

522006000

Abstract:

Polymerizable compositions particularly useful for brightness enhancing films.