15. A system for evaluating a patent portfolio, comprising patent documents, by one or more experts, the system comprising: a computer having a processor, and a computer readable medium having computer readable instructions stored thereon for execution by the processor, causing the processor to: (a) determine a bias of each said expert by comparing results of evaluation of at least one test patent document performed by each said expert with a predetermined evaluation of said test patent document; and (b) evaluate the patent documents from the patent portfolio by said experts according to an evaluation method, which is bias corrected for each said expert so that to compensate for the bias associated with each said expert; further comprising computer readable instructions stored in the computer readable medium, causing the processor to: evaluate a patent document from the patent portfolio according to an evaluation method, which processes a number of patent indices, characterizing different aspects of the patent document, into a Patent Quality index (PQ), characterizing value of the patent document, according to a non-linear function of said patent indices; select the non-linear function, which is characterized by a parameter of non-linearity, corresponding to a bias of an expert, the function being selected so that to compensate for the bias of the expert; select the non-linear function, which is continuous monotonously increasing or decreasing, bounded on the interval of variations of the patent indices, and processes the patent indices into the PQ as follows: when a value of any patent index lends substantially to its minimal value, then the PQ also tends substantially to its minimal value for the increasing function, and to its maximal value for the decreasing function.
15. A system for evaluating a patent portfolio, comprising patent documents, by one or more experts, the system comprising: a computer having a processor, and a computer readable medium having computer readable instructions stored thereon for execution by the processor, causing the processor to: (a) determine a bias of each said expert by comparing results of evaluation of at least one test patent document performed by each said expert with a predetermined evaluation of said test patent document; and (b) evaluate the patent documents from the patent portfolio by said experts according to an evaluation method, which is bias corrected for each said expert so that to compensate for the bias associated with each said expert; further comprising computer readable instructions stored in the computer readable medium, causing the processor to: evaluate a patent document from the patent portfolio according to an evaluation method, which processes a number of patent indices, characterizing different aspects of the patent document, into a Patent Quality index (PQ), characterizing value of the patent document, according to a non-linear function of said patent indices; select the non-linear function, which is characterized by a parameter of non-linearity, corresponding to a bias of an expert, the function being selected so that to compensate for the bias of the expert; select the non-linear function, which is continuous monotonously increasing or decreasing, bounded on the interval of variations of the patent indices, and processes the patent indices into the PQ as follows: when a value of any patent index lends substantially to its minimal value, then the PQ also tends substantially to its minimal value for the increasing function, and to its maximal value for the decreasing function. 17. The system as described in claim 15 , further comprising computer readable instructions stored in the computer readable medium, causing the processor to visualize results of the patent portfolio evaluation by color coding the results in accordance with a color model.