Douglas Y Townsend, 622060 Commerce Dr, Sidney, OH 45365

4624766, Nov 25, 1986

Jul 3, 1985

6/752442

Larry G. Boxall - Baltimore MD
William M. Buchta - Baltimore MD
Arthur V. Cooke - Baltimore MD
Dennis C. Nagle - Catonsville MD
Douglas W. Townsend - Glen Burnie MD

Commonwealth Aluminum Corporation - Bethesda MD

C25C 308
C25B 1112
C04B 3500
B29C 5900

204294

Aluminum cells may be produced having cathode surfaces which are wetted by aluminum, said surfaces comprising Refractory Hard Materials in a non-graphitized carbon matrix. Such cells may utilize inclined or drained cathodes as well as non-consumable anodes.

4526911, Jul 2, 1985

Jul 22, 1982

6/400772

Larry G. Boxall - Baltimore MD
William M. Buchta - Baltimore MD
Arthur V. Cooke - Baltimore MD
Dennis C. Nagle - Catonsville MD
Douglas W. Townsend - Glen Burnie MD

Martin Marietta Aluminum Inc. - Bethesda MD

C08K 304
C08L 6300

523445

This invention relates to an improved coating composition for application to aluminum cell cathodes, wherein said composition comprises a Refractory Hard Material, and a thermosetting resinous binder system. The resinous binder system is characterized by a char yield greater than 25 percent, while the coating composition exhibits expansion characteristics such as to adhere to a cathode block at temperatures up to and including those normally encountered in the operation of an aluminum cell. The ablation rate of the carbon system utilized is essentially equal to the combined wear and dissolution rate of the Refractory Hard Material in an aluminum cell environment.

4466996, Aug 21, 1984

Jul 22, 1982

6/400773

Larry G. Boxall - Baltimore MD
William M. Buchta - Baltimore MD
Arthur V. Cooke - Baltimore MD
Dennis C. Nagle - Catonsville MD
Douglas W. Townsend - Glen Burnie MD

Martin Marietta Corporation - Bethesda MD

B05D 512
C25C 306
C25B 1112

427122

This invention relates to a method for the application of a coating composition containing Refractory Hard Material to a cathode substrate to prepare an aluminum wettable cathode surface. A mixture of Refractory Hard Material and carbon system is applied to a cathode substrate, cured and carbonized to a non-graphitized carbon matrix containing Refractory Hard Material, characterized by strong bonding of said matrix to said substrate and an ablation rate of said carbon matrix similar to the combined rate of wear and dissolution of the Refractory Hard Material.

5158655, Oct 27, 1992

May 10, 1991

7/697992

Douglas W. Townsend - Glen Burnie MD

C25C 306
C25D 366

204 67

The invention relates to a process of electrowinning molten aluminum from alumina dissolved in molten fluoride salts which are essentially cryolite. More specifically the process relates to placing refractory metal raised cathode structures in aluminum reduction cells and treating the raised cathode surfaces to coat them with refractory metal borides. This process deposits coatings composed of titanium diboride and other refractory metal borides on titanium and other refractory metal cathode structures from supersaturated elements dissolved in electrowon molten aluminum. The refractory metal boride coatings are resistant to penetration by the molten aluminum metal.

4544469, Oct 1, 1985

Jul 22, 1982

6/400762

Larry G. Boxall - Baltimore MD
William M. Buchta - Baltimore MD
Arthur V. Cooke - Baltimore MD
Dennis C. Nagle - Catonsville MD
Douglas W. Townsend - Glen Burnie MD

Commonwealth Aluminum Corporation - Bethesda MD

C25C 308
C25C 702
C25B 1112

204243R

Aluminum cells may be produced having cathode surfaces which are wetted by aluminum, said surfaces comprising Refractory Hard Materials in a non-graphitized carbon matrix. Such cells may utilize inclined or drained cathodes as well as non-consumable anodes.

5227045, Jul 13, 1993

Dec 30, 1991

7/814596

Douglas W. Townsend - Glen Burnie MD

C25D 904
C25C 306

205230

This invention relates to a process of electrowinning molten aluminum from alumina dissolved in molten fluoride salts which is essentially cryolite. More specifically the process relates to the treatment of aluminum reduction cell drained solid cathode surfaces to protect them while they are wetted by molten aluminum metal. This process produces aluminum wetted protective coatings composed of titanium diboride and titanium carbide and other refractory metal borides and carbides on top of a carbon-titanium diboride materials layer on the cathode surfaces from supersaturated dissolved elements in electrowon aluminum. The resulting protective coating is resistant to erosion, chemical attack, and penetration by molten aluminum metal, sodium, and cryolite electrolyte contained in that cell.

4795540, Jan 3, 1989

Nov 25, 1987

7/125760

Douglas W. Townsend - Glen Burnie MD

Comalco Aluminum, Ltd. - Melbourne

C25C 308
C25C 316

204243R

An electrolytic reduction cell for the production of aluminum having a slotted cathode collector bar. The slots are filled with insulating material thereby directing the electrical current flow through the cathode collector bar in a manner which reduces the horizontal current components in the cell.

5028301, Jul 2, 1991

Jan 9, 1989

7/294781

Douglas W. Townsend - Glen Burnie MD

C25D 366
C25C 306
B05D 512

204 39

This invention relates to a process for electrowinning molten aluminum from alumina dissolved in molten fluoride salts which are essentially cryolite. More specifically the process relates to the treatment of aluminum reduction cell drained solid cathode surfaces to make them wetted by molten aluminum metal. This process deposits a coating composed of titanium diboride and titanium carbide on the solid cathode surfaces from supersaturated dissolved elements in electrowon aluminum. The electrowon aluminum wets the coating on the cathode. The coating makes the cathode surfaces resistant to erosion, chemical attack and penetration by the molten aluminum metal, sodium and cryolite electrolyte contained in that cell.