1
Elton M Botts: Control unit for oil wells. Energy 76, Clarence A O Brien, Harvey B Jacobson, July 25, 1978: US04102394 (128 worldwide citation)

A control unit for oil wells for maximizing the efficiency of a producing oil well field, including the use of a variable speed AC motor powering each oil well pump jack, which enables the operator to control the strokes per minute on the pump unit and adjust the speed of the upstroke relative to th ...


2
Sanford D DeLong: Electromagnetic reciprocating pump and motor means. Energy 76, Paul M Denk, September 17, 1985: US04541787 (38 worldwide citation)

An electromagnetic reciprocating motor or pump for use for providing mechanical force for actuation of other fluids or components, and includes a cylinder provided with closures at each end, at least a pair of electromagnets operatively associated with the cylinder, and surrounding the same, a magne ...


3
Elton M Botts: Cryogenic temperature operated magnetic reciprocating motor system. Energy 76, Paul M Denk, July 10, 1979: US04160924 (1 worldwide citation)

A permanent magnet armature is reciprocated between electromagnetic coil assemblies in a motor chamber that is evacuated and maintained at a cryogenic temperature by circulation of a cryogenic cooling medium through pressure sealed, coil enclosing spaces of the coil assemblies. Shock absorbers absor ...