Thomas H. Lewis Jr.
Engineering at Edgewood Cv, Hattiesburg, MS

4175021, Nov 20, 1979

Mar 6, 1978

5/884057

Joe F. Tatum - Hattiesburg MS
Thomas H. Lewis - Hattiesburg MS

C. E. Equipment Co., Inc. - Hattiesburg MS

C23F 1300

204196

An apparatus for and method of preventing end effect in deep well impressed current anodes surrounded by a carbonaceous backfill in which the opposite ends of an elongated slender anode are of non-conducting material and the remainder of the anode includes a plurality of alternating segments of conducting and non-conducting material along substantially the entire surface length of the anode. The anode is connected to a source of impressed electrical current and the non-conducting segments cause a substantially constant impressed current density to be transferred from each of the conducting segments along the length of the anode as an electronic discharge and substantially prevents any electrolytic discharge therefrom.

4401540, Aug 30, 1983

Oct 29, 1980

6/201949

Joe F. Tatum - Hattiesburg MS
Thomas H. Lewis - Hattiesburg MS

C.E. Equipment Co., Inc. - Hattiesburg MS

C23F 1300

204196

An apparatus for reducing end effect in anodes used in cathodic protection systems for underground metallic structures and in which the anodes are surrounded by and are in intimate engagement with a carbonaceous material so that an impressed current which is supplied to the anode is discharged from the anode in a substantially uniform current discharge density which is maintained at a level that is electronically conducted by the carbonaceous backfill to the earth. The anode includes an elongated body of electrically conducting material having a plurality of non-conducting segments which separate the body into conducting areas of non-uniform size and which take advantage of mutual interference between adjacent conducting areas to substantially prevent electrolytic current discharge from the anode.

5026508, Jun 25, 1991

May 11, 1990

7/522035

Joseph F. Tatum - Hattiesburg MS
Thomas H. Lewis - Hattiesburg MS

Cathodic Engineering Equipment Co., Inc. - Hattiesburg MS

H01B 118, C23F 1306

252502

A low resistance non-permeable backfill especially for use in vertical anode beds for the cathodic protection of subsurface metallic structures includes a mixture of portland cement, calcined fluid petroleum coke, micro-size carbon rods and high structure carbon black mixed with water and pumped as a high density fluidized suspension into the anode bed, particularly around the casing of a deep anode bed of the general type described in U. S. Pat. No. 3,725,699 to Tatum.

4994629, Feb 19, 1991

Jul 10, 1990

7/550637

Joseph F. Tatum - Hattiesburg MS
Thomas H. Lewis - Hattiesburg MS

Cathodic Engineering Equipment Co., Inc. - Hattiesburg MS

H01R 466, H01B 118, C09K 300

174 6

An electrical ground system as a metal conductor surrounded by a composition comprising a mixture of portland cement, sized calcined fluid petroleum coke, micro-carbon rods and carbon black.

5080773, Jan 14, 1992

Apr 5, 1991

7/680751

Joseph F. Tatum - Hattiesburg MS
Thomas H. Lewis - Hattiesburg MS

Cathodic Engineering Equipment Co., Inc. - Hattiesburg MS

C23F 1300, H01R 466

204196

A low resistance non-permeable backfill especially for use in vertical anode beds for the cathodic protection of subsurface metallic structures includes a mixture of portland cement, calcined fluid petroleum coke, micro-size carbon rods and high structure carbon black.