John Mathew

US Patent:

20090192248, Jul 30, 2009

Filed:

Dec 5, 2008

Appl. No.:

12/315694

Inventors:

Paul S. Palumbo - West Newton MA, US
Dave S. Pope - Andover MA, US
John Mathew - Hampton NH, US

International Classification:

C08K 5/17
C08G 63/00

US Classification:

524186, 524599, 524539

Abstract:

The present invention relates to a method of preparing a pigment composition comprising the steps of combining at least one polyamine, at least one pigment, and at least one polymer having at least one carboxylic acid group or salt thereof. Various embodiments of this method are disclosed. The present invention further relates to a pigment composition and uses thereof, such as inkjet ink compositions.

US Patent:

20120048130, Mar 1, 2012

Filed:

Aug 29, 2011

Appl. No.:

13/220563

Inventors:

John Ebenezer Mathew - Quincy MA, US

International Classification:

B30B 15/06

US Classification:

100297

Abstract:

A squeezing device allows a user to squeeze a teabag or other packet that has been soaked in a liquid. The squeezing device is substantially flat and has a pair of squeezing pads connected by a strip that is bendable. The squeezing pads receive a teabag there between when the pads are bent together such that a user exerts force directly against the teabag to drain its contents.

US Patent:

6328894, Dec 11, 2001

Filed:

Jan 29, 1999

Appl. No.:

9/240291

Inventors:

Michael K. Chan - Waltham MA
Joseph E. Johnson - Nashua NH
John Mathew - Nashua NH
Friedrich K. von Gottberg - Cambridge MA

Assignee:

Cabot Corporation - Boston MA

International Classification:

B01D 2126
B01D 6114
B01D 6144

US Classification:

210638

Abstract:

A process to purify and classify a dispersion containing stabilized particles having counterions and ions as well as free species is disclosed. The solution may comprise an aqueous media, a solvent media, or a combination of both and can include more than one type of aqueous and/or solvent solutions. The process includes at least the steps, in any order, of substantially removing the particles having sizes above about 1 micron, preferably above 0. 5 micron; substantially removing the free species; and exchanging at least a portion of the counterions that are a part of the stabilized particles. The process disclosed is especially useful in purifying dispersions where the ionic stabilized colloidal particles are carbon black having attached organic groups comprising at least one ionic group, or at least one ionizable group, or mixtures thereof.