Frederick H Parker

US Patent:

55189105, May 21, 1996

Filed:

Dec 5, 1994

Appl. No.:

8/347995

Inventors:

Frederick J. Parker - Columbia MD
Awdhoot V. Kerkar - Columbia MD
Rasto Brezny - Catonsville MD

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

C12N 1114
B01J 2020

US Classification:

435176

Abstract:

A bioremediation support for the support of microorganisms used in the biotreatment of an aqueous waste stream or contaminated vapor is made of a low-density siliceous glassy material. This material has a cellular or frothy texture, large pores of greater than 1,000 Anstrom units in diameter dispersed throughout the material, a high macropore volume in pores of greater than 1,000. ANG. of more than 0. 3 cc/cc and a BET surface area of greater than 10 m. sup. 2 /g. A preferred material is pumice.

US Patent:

47585420, Jul 19, 1988

Filed:

Aug 7, 1987

Appl. No.:

7/082698

Inventors:

Frederick J. Parker - Columbia MD

Assignee:

W. R. Grace & Co. - New York NY

International Classification:

C04B 3546
C04B 3548
C04B 3549

US Classification:

501134

Abstract:

A low thermal expansion ceramic composition having a predominant Al. sub. 2 TiO. sub. 5 phase along with zirconium titanate and zirconia phases. The final overall ceramic composition after firing has a low thermal expansion between 24. degree. -1000. degree. C. of not greater than 1. 5. times. 10. sup. -6. degree. C. sup. -1 and a thermal stability in air such that (a) upon heating to 1200. degree. C. for at least 4 hours there is substantially no decomposition of the Al. sub. 2 TiO. sub. 5 phase to rutile or alumina as measured by X-ray diffraction, (b) physical growth after thermal cycling between 200. degree. and 1150. degree. C. for 300 cycles does not exceed 1. 5%, and (c) the composition maintains a low average thermal expansion between 24. degree. -1000. degree. C. of not greater than 1. 5. times. 10. sup. -6. degree. C. sup. -1 after the isothermal heating or cycling conditions.

US Patent:

53977556, Mar 14, 1995

Filed:

Jun 29, 1993

Appl. No.:

8/084850

Inventors:

Frederick J. Parker - Columbia MD
Awdhoot V. Kerkar - Columbia MD
Rasto Brezny - Catonsville MD

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

B01J 2020
B01J 3736

US Classification:

502 7

Abstract:

A bioremediation support for the support of microorganisms used in the biotreatment of an aqueous waste stream or contaminated vapor is made of a low-density siliceous glassy material. This material has a cellular or frothy texture, large pores of greater than 1,000 Anstrom units in diameter dispersed throughout the material, a high macropore volume in pores of greater than 1,000. ANG. of more than 0. 3 cc/cc and a BET surface area of greater than 10 m. sup. 2 /g. A preferred material is pumice.

US Patent:

51107724, May 5, 1992

Filed:

Aug 30, 1990

Appl. No.:

7/575102

Inventors:

Frederick J. Parker - Columbia MD

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

C04B 3548

US Classification:

501 97

Abstract:

Ternary CaO-TiO. sub. 2 -SiO. sub. 2 compositions are discussed. These compositions are useful as sintering aids for silicon nitride sintering. Use of these ternary compositions allows silicon nitride to be effectively sintered at lower temperatures than when conventional yttria sintering aids are used.