Jayprakash C Bhatt

US Patent:

6369262, Apr 9, 2002

Filed:

Mar 10, 1999

Appl. No.:

09/266231

Inventors:

Richard P. Chartoff - Cincinnati OH
Jayprakash C. Bhatt - Waltham MA
Tat H. Tong - Dayton OH

Assignee:

University of Dayton - OH

International Classification:

C07C 6976

US Classification:

560 66, 560221

Abstract:

Rigid-rod monomers and polymers are provided for use in applications such as rapid prototyping, composites and adhesives. The monomers can be photocured through the end groups and then thermally post cured through the acetylene groups. The result is a highly crosslinked polymer having an effective glass transition temperature well above 200Â C.

US Patent:

6380340, Apr 30, 2002

Filed:

Oct 16, 2000

Appl. No.:

09/688998

Inventors:

Richard P. Chartoff - Cincinnati OH
Jayprakash C. Bhatt - Waltham MA
Tat H. Tong - Dayton OH

Assignee:

University of Dayton - Dayton OH

International Classification:

C08F12010

US Classification:

526285, 528361, 528425

Abstract:

Rigid-rod monomers and polymers are provided for use in applications such as rapid prototyping, composites and adhesives. The monomers can be photocured through the end groups and then thermally post cured through the acetylene groups. The result is a highly crosslinked polymer having an effective glass transition temperature well above 200Â C.

US Patent:

6493015, Dec 10, 2002

Filed:

Mar 29, 2001

Appl. No.:

09/821413

Inventors:

Jayprakash C. Bhatt - Waltham MA
Hyung-Chul Choi - Lexington MA
F. Richard Cottrell - Westport MA
Anemarie De Young - Lexington MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

B45J 2325

US Classification:

347171, 347172, 347176

Abstract:

A thermal transfer recording system wherein an area of a thermal transfer imaging medium is heated imagewise while in contact only with a thermal printing head and the imaged area of the thermal transfer recording medium subsequently transferred to a receiver material.

US Patent:

6801233, Oct 5, 2004

Filed:

May 20, 2002

Appl. No.:

10/151432

Inventors:

Jayprakash C. Bhatt - Waltham MA
Brian D. Busch - Sudbury MA
Daniel P. Bybell - Medford MA
F. Richard Cottrell - Westport MA
Anemarie DeYoung - Lexington MA
Chien Liu - Wayland MA
Stephen J. Telfer - Arlington MA
Jay E. Thornton - Watertown MA
William T. Vetterling - Lexington MA

Assignee:

Polaroid Corporation - Waltham MA

International Classification:

B41J 232

US Classification:

347175

Abstract:

A multicolor imaging system is described wherein at least two, and preferably three, different image-forming layers of a thermal imaging member are addressed at least partially independently by a thermal printhead or printheads from the same surface of the imaging member by controlling the temperature of the thermal printhead(s) and the time thermal energy is applied to the image-forming layers. Each color of the thermal imaging member can be printed alone or in selectable proportion to the other color(s). Novel thermal imaging members are also described.

US Patent:

6890614, May 10, 2005

Filed:

Sep 5, 2003

Appl. No.:

10/656539

Inventors:

Makarand P. Gore - Corvallis OR, US
Jayprakash Bhatt - Corvallis OR, US
Vladek P Kasperchik - Corvallis OR, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

B32B003/02

US Classification:

428 641, 428 644, 428 648, 43027011, 4304951, 503212, 503216

Abstract:

Compositions and methods for production of color images using leuco dye-containing color forming compositions are described. The color forming composition can include a color forming leuco dye, a metal salt activator, a suppression agent configured for inhibiting the activity of the metal salt activator until application of energy in the form of heat or light, and an initiator precursor. The initiator precursor is capable of liberating scavenger species which reduce the inhibiting action of the suppression agent. The color forming compositions can be a single phase mixture of a leuco dye, metal salt activator, suppression agent, and initiator precursor which are stable under ambient conditions and form a colored composition upon application of energy.

US Patent:

6906735, Jun 14, 2005

Filed:

Oct 4, 2004

Appl. No.:

10/958139

Inventors:

Jayprakash C. Bhatt - Waltham MA, US
Brian D. Busch - Sudbury MA, US
Daniel P. Bybell - Medford MA, US
F. Richard Cottrell - Westport MA, US
Anemarie DeYoung - Lexington MA, US
Chien Liu - Wayland MA, US
Stephen J. Telfer - Arlington MA, US
Jay E. Thornton - Watertown MA, US
William T. Vetterling - Lexington MA, US

Assignee:

Polaroid Corporation - Waltham MA

International Classification:

B41J002/32
B41J002/525
B41M005/40
B14M005/34

US Classification:

347175, 347221

Abstract:

A multicolor imaging system is described wherein at least two, and preferably three, different image-fonning layers of a thermal imaging member are addressed at least partially independently by a thermal printhead or printheads from the same surface of the imaging member by controlling the temperature of the thermal printhead(s) and the time thermal energy is applied to the image-forming layers. Each color of the thermal imaging member can be printed alone or in selectable proportion to the other color(s). Novel thermal imaging members are also described.

US Patent:

7060654, Jun 13, 2006

Filed:

Oct 28, 2003

Appl. No.:

10/695718

Inventors:

Vladek P Kasperchik - Corvallis OR, US
Makarand P. Gore - Corvallis OR, US
Marshall Field - Corvallis OR, US
Jayprakash Bhatt - Corvallis OR, US

Assignee:

Hewlett-Packard Development Company - Houston TX

International Classification:

B41M 5/30

US Classification:

503208, 106 3116, 106 3117, 106 3118, 106 3119, 106 322, 106 3122, 427151, 427150, 503209, 503216, 503221

Abstract:

A coating includes an antenna uniformly distributed in both a matrix and a leuco-dye phase of the coating. A method for preparing an imaging material includes providing a powder having an activator and an antenna, dissolving the activator/antenna powder to form an activator/matrix pre-polymer solution, providing a leuco-dye alloy, and dispersing the leuco-dye alloy into the activator/matrix pre-polymer solution to form a radiation-curable paste. An image-recording medium includes a matrix having an antenna and an activator, and an alloy dispersed in the matrix as an independent phase. The alloy includes an antenna, a leuco-dye, and an accelerator.

US Patent:

7141360, Nov 28, 2006

Filed:

Jun 9, 2004

Appl. No.:

10/864016

Inventors:

Vladek Kasperchik - Corvallis OR, US
Jayprakash C. Bhatt - Corvallis OR, US
Cari L Dorsh - McMinnville OR, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G03C 1/73
G03C 1/74
B41M 5/30

US Classification:

430343, 430332, 430338, 430340, 430964, 503214, 503216, 503226

Abstract:

Imaging layers, image recording media, and methods of preparation of each, are provided. One exemplary embodiment of the imaging layer, among others, includes a matrix, a radiation absorbing compound dissolved in the matrix, at least two activators substantially dissolved in the matrix, and a color former. The activators can include a primary activator having a higher acidity than a secondary activator. In addition, the primary activator has a lower solubility in the matrix than the secondary activator. The color former is substantially insoluble in the matrix at ambient conditions and is substantially uniformly distributed in the matrix.