21. A system for evaluating a patent document, comprising: data input means for receiving an input data with regard to one or more patent indices, characterizing different aspects of the patent document, each patent index having a single numerical value and being defined on a bounded interval for each said patent index having respective minimal and maximal values; and a Patent Quality processing unit, comprising a computer program code stored in a computer memory, for processing the input data into a Patent Quality (PQ) index according to a deterministic non-linear transformation of said patent indices, said PQ index having a single numerical value; a monetary value of the patent document being a function of said PQ index; said non-linear transformation being continuous, monotonous with respect to each of said patent indices, and said PQ index being varied on a bounded interval for the PQ index having respective PQ min and PQ max values; said non-linear transformation being non-linear with respect to at least one of said patent indices; wherein said patent indices and said non-linear transformation are chosen so as to satisfy the following: tending of any one of said patent indices substantially to a respective minimal value, results in said Patent Quality index tending substantially to one of the following, independent of values of other patent indices: the PQ min ; the PQ max ; and wherein said non-linear transformation has a parameter of non-linearity expressed as a real number, and wherein said non-linear transformation is a single-valued transformation providing a single numerical value for said PQ index for any parameter of non-linearity.
32. The system as described in claim 21 , wherein the PQ min is equal to zero.