A packer apparatus for use in a subterranean well comprises an inner mandrel and means for applying tension to the inner mandrel to set radially expandable slips and packing elements. The mandrel can be releasably positioned in a first position to secure the slips and packing element in the retracted...http://www.google.com/patents/US4610300?utm_source=gb-gplus-sharePatent US4610300 - Tubing actuated retrievable packer
