04796708 is referenced by 42 patents and cites 10 patents.

A downhole safety valve for a subterranean well comprises an axially shiftable valve head which is movable between open and closed positions by an actuating member. The actuating member is axially shifted by a device mechanism which is manipulated by an electric motor. The electric motor is preferably actuated by downhole batteries and the energization and de-energization of the electric motor is preferably controlled from the well surface by electromagnetic waves. A locking mechanism engages the actuating member of the safety valve in its open position through the energization of an electric solenoid, also preferably controlled from the well surface by electromagnetic waves.

Title
Electrically actuated safety valve for a subterranean well
Application Number
7/164866
Publication Number
4796708
Application Date
March 7, 1988
Publication Date
January 10, 1989
Inventor
Jeffrey J Lembcke
Broken Arrow
OK, US
Agent
Hubbard Thurman Turner & Tucker
Assignee
Baker Hughes Incorporated
TX, US
IPC
G01V 1/40
E21B 34/16
E21B 34/06
View Original Source