A ball drop tool for dropping an actuating ball to a ball seat located in a tool or tool string therebelow. The ball drop tool includes a housing with a ball drop cage positioned therein. The ball drop cage has a rocker arm pivotably attached thereto. In a first position, the rocker arm retains the actuating...http://www.google.es/patents/US20050039925?utm_source=gb-gplus-sharePatente US20050039925 - Downhole ball drop tool
Número de solicitud: 10/646,482 Número de publicación: US 2005/0039925 A1 Fecha de presentación: 22 Ago 2003 Patente emitida: US6959766 ( Fecha de emisión 1 Nov 2005)
