Aaron Washington Barkatt

49959840, Feb 26, 1991

Sep 18, 1989

7/408289

Aaron Barkatt - Silver Spring MD

Pedro B. Macedo - Bethesda MD
Theodore Aaron Litovitz - Annapolis MD

C02F 128

210670

Compositions comprising carbon-based supports and containing heteropolycyclic compounds such as bipyridyl, phenanthroline or derivatives thereof are used in separation of dissolved late transition metals such as Fe, Co, Ni and Cu from solutions, in particular when such solutions contain high concentrations of other dissolved metals such as Zr, Hf, La, Al and Ba. Such compositions are also used to separate late transition metals such as Pt group metals from each other.

62883003, Sep 11, 2001

Jul 14, 1999

9/357346

Miriam Lemus - Greenbelt MD
Aaron Barkatt - Silver Spring MD
Marta Gmurczyk - Silver Spring MD
Galina Cherepakhov - Cliffside Park NJ

Consolidated Edison Company of New York, Inc. - New York NY

G21F 900

588 1

Organic materials are mixed with metal oxide, such as hydrated metal oxides, prior to or during heat treatments in aerated or oxygenated environments to stabilize thermal decomposition or incineration of the organic materials and to suppress the emission of volatile, hazardous organic compounds. The organic materials may be ion exchange resins and polymeric sorbents, for example, and include contaminated materials such as hazardous wastes. The hydrated metal oxides may be hydrated ferric oxide, hydrated aluminum oxide or hydrated titania oxide, for examples. Ferrihydrite is preferred. The heat treatment may be a preparation for a waste disposal process, such as immobilization in ferric oxide, cement, concrete, a polymer, bitumen or glass, for example. Immobilization processes in ferric oxide are also discussed, including the use of additives such as magnesium oxide, ammonium dihydrogen phosphate and phosphoric acid, enabling consolidation at room temperature and pressures less than 15,000 psi.

46594779, Apr 21, 1987

Jul 28, 1983

6/517472

Pedro B. Macedo - Bethesda MD
Aaron Barkatt - Silver Spring MD

B01D 1504
G21F 902
G21F 912
B01J 2002

210679

A composition comprising a support such as a porous silicate glass or silica gel or charcoal having interconnected pores and containing heavy metal cations of mercury, thallium, silver, platinum, palladium, lead or copper capable of forming a stable complex with an anion bonded to the support. The preferred heavy metal cation is a mercury cation. The composition is especially useful for removing radioactive iodine from liquid and gaseous waste streams.

52702928, Dec 14, 1993

Feb 25, 1991

7/659719

Hamid Hojaji - Bethesda MD
Aaron Barkatt - Silver Spring MD

The Catholic University of America - Washington DC

H01B 1206
H01L 3912

505 1

Improved superconducting materials with high maximum magnetization, remanent magnetization and diamagnetic susceptibility can be made by enriching the base Y-Ba-Cu-O composition, Y:Ba:Cu=1:2:3, with respect to Y, or adding other trivalent or pentavalent elements (e. g. rare earths, Nb) to this composition. The mixed oxide materials are heated to melt a substantial fraction of their weight, quenched to a low temperature, re-heated to a temperature lower than the one initially used to effect melting, and annealed by slow cooling under air or oxygen.

6084146, Jul 4, 2000

Sep 12, 1996

8/713243

Aaron Barkatt - Silver Spring MD
Ewa Labuda - Bowie MD
Marta Gmurczyk - Silver Spring MD
Donna M. Wilder - Washington DC

Consolidated Edison Company of New York, Inc. - New York NY

G21F 900

588 10

Processes for immobilizing solid contaminated materials, such as radioactive species, hazardous species, or combinations of both radioactive and hazardous species, comprise mixing the contaminated materials with hydrated ferric oxides, and then pressing the mixture at a temperature of at least about 150. degree. C. and gradually removing a large part of the water while under pressure to produce a solid composition. The water content of the mixture is adjusted if necessary. Contaminated materials dissolved or suspended in an aqueous solution can be immobilized by precipitating hydrated ferric oxide in the solution, and adjusting the water content and pressing, as above. In another process in accordance with the present invention, hydrated ferric oxides are deposited on metal surfaces. The deposited ferric oxide is pressed to produce a solid coating adhered to the surface, to retard corrosion. A ceramic body of ferric oxide composition may also be made in accordance with the present invention.

46541462, Mar 31, 1987

Mar 25, 1985

6/715207

Aaron Barkatt - Silver Spring MD
Pedro B. Macedo - Bethesda MD

B01D 1504

210670

A process for removing heavy alkali metal cations from solution comprising passing a liquid over a composition including a support such as charcoal having interconnected pores containing a tetra-aryl boron moiety associated with an ion exchangeable cation absorbed on the support capable of forming a stable compound with a heavy alkali metal cation.

46489754, Mar 10, 1987

Feb 27, 1986

6/833263

Aaron Barkatt - Silver Spring MD
Pedro B. Macedo - Bethesda MD

B01D 1508

210656

Silica-based chromatographic and reactive materials are disclosed with surfaces modified to contain or to be coated with oxides, hydrous oxides, hydroxides, carbonates or silicates of aluminum, iron, or other suitable metals such as zirconium or titanium. The materials exhibit good resistance to dissolution and resulting loss of activity or clogging. This good resistance is particularly evident even in the high pH region (above 8-9) and in the high temperature region (above 35. degree. C. ) where the dissolution rates and solubilities of aluminosilicates and of trivalent iron oxides are much smaller than those of silica.

48762326, Oct 24, 1989

Sep 28, 1987

7/101920

Aaron Barkatt - Silver Spring MD

B01J 2020
B01J 2022
C01G 5500
C02F 142

502417

Compositions comprising carbon-based supports and containing heteropolycyclic compounds such as bipyridyl, phenanthroline or derivatives thereof are used in separation of dissolved late transition metals such as Fe, Co, Ni and Cu from solutions, in particular when such solutions contain high concentrations of other dissolved metals such as Zr, Hf, La, Al and Ba. Such compositions are also used to separate late transition metals such as Pt group metals from each other.