Douglas G Townsend

US Patent:

7878748, Feb 1, 2011

Filed:

Apr 18, 2007

Appl. No.:

11/785554

Inventors:

Douglas W. Townsend - Annapolis MD, US

International Classification:

F16B 35/00

US Classification:

411424

Abstract:

A metal bolt or cap screw fastener has a head, a shank of reduced cross section and a threaded portion, which fastener is configured to be manufactured using cold forming automatic bolt making machines of concurrent configuration. The reduced cross section shank provides additional elastic stretch and reduces stress throughout the fastener upon application of external joint parting loads, as compared to conventional fasteners with nominal diameter shanks. The inventive fastener has at least three straight longitudinal ribs along the length of the reduced cross section shank. The longitudinal ribs extend laterally outward from the surface of the shank a distance substantially corresponding to the fastener nominal diameter so as to center the fastener within round holes. During cold forming, the fastener shank diameter is made to the same or somewhat larger diameter than the not yet threaded part of the bolt.

US Patent:

46247661, Nov 25, 1986

Filed:

Jul 3, 1985

Appl. No.:

6/752442

Inventors:

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

Assignee:

Commonwealth Aluminum Corporation - Bethesda MD

International Classification:

C25C 308
C25B 1112
C04B 3500
B29C 5900

US Classification:

204294

Abstract:

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.

US Patent:

45269114, Jul 2, 1985

Filed:

Jul 22, 1982

Appl. No.:

6/400772

Inventors:

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

Assignee:

Martin Marietta Aluminum Inc. - Bethesda MD

International Classification:

C08K 304
C08L 6300

US Classification:

523445

Abstract:

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.

US Patent:

44669968, Aug 21, 1984

Filed:

Jul 22, 1982

Appl. No.:

6/400773

Inventors:

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

Assignee:

Martin Marietta Corporation - Bethesda MD

International Classification:

B05D 512
C25C 306
C25B 1112

US Classification:

427122

Abstract:

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.

US Patent:

51586550, Oct 27, 1992

Filed:

May 10, 1991

Appl. No.:

7/697992

Inventors:

Douglas W. Townsend - Glen Burnie MD

International Classification:

C25C 306
C25D 366

US Classification:

204 67

Abstract:

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.

US Patent:

45444692, Oct 1, 1985

Filed:

Jul 22, 1982

Appl. No.:

6/400762

Inventors:

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

Assignee:

Commonwealth Aluminum Corporation - Bethesda MD

International Classification:

C25C 308
C25C 702
C25B 1112

US Classification:

204243R

Abstract:

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.

US Patent:

52270459, Jul 13, 1993

Filed:

Dec 30, 1991

Appl. No.:

7/814596

Inventors:

Douglas W. Townsend - Glen Burnie MD

International Classification:

C25D 904
C25C 306

US Classification:

205230

Abstract:

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.

US Patent:

47955406, Jan 3, 1989

Filed:

Nov 25, 1987

Appl. No.:

7/125760

Inventors:

Douglas W. Townsend - Glen Burnie MD

Assignee:

Comalco Aluminum, Ltd. - Melbourne

International Classification:

C25C 308
C25C 316

US Classification:

204243R

Abstract:

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.