Patent ID: 7392964

Claim:
A method of using a space station lifeboat, lunar docking logistics module and upper stage propulsion system as a deep space craft for operation beyond low Earth orbit comprising the steps of: fitting the space station lifeboat prior to launch with a heat shield capable of withstanding the extra thermal energy required for a safe return to the Earth's surface from beyond low Earth orbit, launching a docking module from the Earth on a launch vehicle having a final upper stage having sufficient propulsive capability to send both the docking module and lifeboat to an orbit or trajectory beyond low Earth orbit; transferring at least one person as crew from the space station to the lifeboat; docking the lifeboat with the docking module and upper propulsive stage to form the deep space craft; at the appropriate time as determined by orbital mechanics for a flight beyond low earth orbit; launching the deep space craft to an orbit or trajectory beyond low Earth orbit using the propulsive capability of the launch vehicle upper stage; returning the deep space craft to the vicinity of the Earth; separating the lifeboat from the docking module and upper propulsive stage; and landing the lifeboat on the Earth.