Patent ID: 8261564

Claim:
A recovery apparatus, comprising: a compressor to evacuate a gas or liquid from a vessel or system during a first phase and a second phase of a recovery process; a vacuum pump to evacuate the gas or liquid from the vessel or system during the second phase of the recovery process; and a processor to selectively control the compressor and the vacuum pump to evacuate the gas or liquid from the vessel or system, wherein: the processor controls the compressor to operate to evacuate the vessel or system to a first predetermined level during the first phase of the recovery process and determines a first recovery time to evacuate the vessel or system to the first predetermined level, the processor determines a variable second recovery time for the second phase of the recovery process to evacuate the vessel or system from the first predetermined level to a second predetermined level by applying in one or more correlation relations the first recovery time to evacuate the vessel or system to the first predetermined level, and the processor controls the compressor to operate together with the vacuum pump for the variable second recovery time to evacuate the vessel or system to the second predetermined level during the second phase of the recovery process.