George Allen Howell

US Patent:

8476367, Jul 2, 2013

Filed:

Jan 31, 2011

Appl. No.:

13/017317

Inventors:

George D. Howell - Arlington TX, US

Assignee:

Spartech Corporation - St. Louis MO

International Classification:

C08L 53/00

US Classification:

525 95, 525 97, 264 5, 264148

Abstract:

A pellet is formed by a method includes, in one embodiment, dispersing up to about 95% by weight of thermoset rubber particles into a carrier resin to form the plastic compound. The carrier resin includes an olefin block copolymer. The method also includes the steps of extruding the plastic compound through a die having at least one die hole to form at least one extrudate filament, cutting the at least one extrudate filament to a predetermined length to form a plurality of pellets, conveying the pellets to a separator/centrifugal dryer in water having a temperature of about 170 F. or greater, and separating the pellets from the water in the separator/centrifugal dryer so that the pellets are substantially dry upon removal from the separator/centrifugal dryer. The resultant pelletized plastic compound has a flex modulus of less than about 20,000 pounds per square inch (psi).

US Patent:

20030198813, Oct 23, 2003

Filed:

Apr 22, 2002

Appl. No.:

10/127780

Inventors:

George Howell - Arlington TX, US

International Classification:

B32B009/04

US Classification:

428/411100

Abstract:

A roofing membrane is described. The roofing membrane contains at least one thermoplastic layer. The thermoplastic layer contains at least one thermoplastic material and at least one microbial inhibitor integrated into the thermoplastic.

US Patent:

20030224194, Dec 4, 2003

Filed:

Jun 22, 2001

Appl. No.:

09/887307

Inventors:

George Howell - Arlington TX, US
Richard Vance - Garland TX, US
Kenneth Bartz - Baytown TX, US

Assignee:

UVTECH,L.P.

International Classification:

B29C047/00

US Classification:

428/515000, 428/500000, 156/244110

Abstract:

The invention is a polymer system used in the formation of thick polymer sheets. The polymer system has a substitution of syndiotactic polypropylene, syndiotactic ethylene propylene copolymer or poly-1-butene for the typical isotactic polypropylene. These substitutions are present in the amount of at least 20% by weight of the total polymer content. The polymer sheet may be filled or unfilled.

US Patent:

50026240, Mar 26, 1991

Filed:

Apr 22, 1988

Appl. No.:

7/185035

Inventors:

George D. Howell - Arlington TX
R. Michael Mahan - Arlington TX
Irvin E. Hurt - Duncanville TX

Assignee:

Impact Extrusions, Inc. - Irving TX

International Classification:

B29B 4706

US Classification:

156243

Abstract:

A composite sheet material especially suited as a roofing material is disclosed. The sheet is a composite of extruded top and bottom layers. The top layer is formed by extrusion of a mixture of cured rubber particles dispersed in a matrix of polypropylene. The bottom layer is formed by coextrusion with the top layer of a mixture of calcium carbonate and cured rubber particles dispersed in a matrix of polypropylene. The method of fabricating the composite sheet material includes trimming longitudinal edges of the material with powered circular blades as it moves between chill rollers and a pull roller assembly. The material is spooled with minimum winding tension so as to prevent tension forces from being set in the material.

US Patent:

59725206, Oct 26, 1999

Filed:

Feb 12, 1997

Appl. No.:

8/799535

Inventors:

George Howell - Arlington TX

Assignee:

UVTEC, Incorporated - Dallas TX

International Classification:

B32B 2708

US Classification:

428516

Abstract:

A high gloss, impact resistant material is made by coextruding a cap layer of a metallocene polyethylene and clarified random copolymer polypropylene onto a core layer. The coextrusion process is guided by a dual manifold die which reduces the interfacial instability of the melt streams as the cap layer is being applied. When thermoformed, the material retains its gloss and exhibits excellent low temperature impact resistance.