Karen L Gruber

US Patent:

60275618, Feb 22, 2000

Filed:

Apr 12, 1999

Appl. No.:

9/290057

Inventors:

Karen Ann Gruber - Hamilton NJ
John Hen - Macon GA

Assignee:

Engelhard Corporation - Iselin NJ

International Classification:

C04B 1410

US Classification:

106718

Abstract:

In one embodiment, the present invention relates to a cement-based composition containing at least one cementitious material and at least one highly reactive pozzolan, wherein the highly reactive pozzolan comprises spray-dried metakaolin. In another embodiment, the present invention relates to a cement-based composition containing at least one cementitious material and at least one highly reactive pozzolan, wherein the highly reactive pozzolan is characterized as comprised of agglomerated beads of microparticles, the agglomerated beads having a median diameter of at least about 10 microns and the microparticles having a median diameter of about 5 microns or less.

US Patent:

6231632, May 15, 2001

Filed:

May 25, 1999

Appl. No.:

9/318230

Inventors:

Karen A. Gruber - Hamilton NJ
Shireen A. Mamun - East Windsor NJ

Assignee:

Engelhard Corporation - Iselin NJ

International Classification:

C05C 900

US Classification:

71 28

Abstract:

In one embodiment, the present invention relates to a particulate urea composition containing particulate urea; kaolin; and a dispersant, wherein the dispersant is at least one of ammonia based dispersants, sulfonate dispersants, carboxylic acid dispersants and polymeric dispersants. In another embodiment, the present invention relates to a method of making urea, involving the steps of contacting a urea process stream with a slurry comprising a liquid, kaolin, and a dispersant, wherein the dispersant is at least one of ammonia based dispersants, sulfonate dispersants, carboxylic acid dispersants and polymeric dispersants; and recovering urea.