Cortland O Dugger

20020025294, Feb 28, 2002

Aug 13, 2001

09/505215

Cortland Dugger - Upper Marlboro MD, US

C01F017/00
C01F005/02

423/639000, 423/263000, 423/593000

This invention relates to a generic process for producing a refractory oxide which comprises reacting an aqueous hydrogen fluoride solution or its derivatives with: at least one metal fluoride reactant; or at least one metal fluoride reactant and at least one metal oxide reactant; or at least one metal oxide reactant, to produce either a colloidal mixture or a solution; drying either the colloidal mixture or solution; heating the dried product to produce a solid state metal hydroxyfluoride; heating the hydroxyfluoride to a temperature at which it chemically decomposes into a cationically-homogeneous and nanostructured solid state metal oxyfluoride; and performing one of the following heating steps: (i) to a solid state decomposition-temperature where the oxyfluoride chemically decomposes into a refractory oxide; or, (ii) to a molten state decomposition-temperature where the oxyfluoride chemically decomposes into a refractory oxide; or, (iii) to a vapor state decomposition-temperature where the oxyfluoride chemically decomposes into a refractory oxide.

60663057, May 23, 2000

Dec 15, 1997

8/990757

Cortland Otis Dugger - Upper Marlboro MD

C01F 1700
C01F 700

423263

This invention relates to a generic process for producing a refractory oxide which comprises reacting liquid water with: at least one metal fluoride reactant; or at least one metal fluoride reactant and at least one metal oxide reactant; or at least one metal oxide reactant and an aqueous hydrogen fluoride solution, to produce either a colloidal mixture or a solution; drying either the colloidal mixture or solution; heating the dried product to produce a solid state metal hydroxyfluoride; heating the hydroxyfluoride to a temperature at which it chemically decomposes into a cationically-homogeneous and nanostructured solid state metal oxyfluoride; and performing one of the following heating steps: (i) to a solid state decomposition-temperature where the oxyfluoride chemically decomposes into a refractory oxide; or, (ii) to a molten state decomposition-temperature where the oxyfluoride chemically decomposes into a refractory oxide; or, (iii) to a vapor state decomposition-temperature where the oxyfluoride chemically decomposes into a refractory oxide.

39335739, Jan 20, 1976

Mar 27, 1975

5/563008

Cortland O. Dugger - Newton MA

The United States of America as represented by the Secretary of the Air
Force - Washington DC

C01F 700
B01J 1706

156624

A method for growing single crystals which utilizes calcium nitride as a solvent system in the molten solution growth of bulk aluminum nitride crystals.