Thomas S Wilmeth

US Patent:

51961083, Mar 23, 1993

Filed:

Apr 24, 1991

Appl. No.:

7/690703

Inventors:

Thomas S. Wilmeth - Daingerfield TX
Jesse L. Eades - Daingerfield TX

Assignee:

Scot Industries, Inc. - Lone Star TX

International Classification:

C25D 356
C25D 304

US Classification:

205243

Abstract:

A method is shown for constructing portions of a sucker rod pump of the type having a steel plunger with an exterior cylindrical wall and a barrel with a cylindrical bore. A chromium case if formed on the cylindrical bore to a selected depth for receiving the plunger in sliding contact. The chromium case is formed by forming a base electrolyte bath including water, chromic acid, a sulfate component, an alkyl sulphonic acid, and an anion of molybdenum. The bore is then exposed to the aqueous electrolyte bath at a current density and at a plating temperature sufficient to form a chromium deposit of desired thickness on the bore.

US Patent:

50090003, Apr 23, 1991

Filed:

Jul 19, 1989

Appl. No.:

7/383019

Inventors:

Thomas S. Wilmeth - Daingerfield TX
Steven L. Wilmeth - Longview TX
Francis E. Foster - Daingerfield TX

Assignee:

Scot Industries, Inc. - Lone Star TX

International Classification:

C21D 110

US Classification:

2988802

Abstract:

A method of hardening a sucker rod well pump has a step of forming a boronized case on the plunger. Then the plunger is heated and quenched to form a hardened steel supporting layer. A chromium case is formed on the barrel.