An International Search Report (ISR) is issued under the provisions of the Patent Cooperation Treaty (PCT) by an International Search Authority (ISA) chosen at the time of filing of the PCT application. The ISR includes a list of identified documents, in the form of a Search Report, which may be relevant to the patentability of the claims in the PCT application. Along with the Search Report, the ISA also issues a Written Opinion underlying the basis of the evaluation of the patentability of claims by the ISA. Responding to the ISR issued by the ISA may help in expediting the prosecution of the PCT application when it enters the National/Regional Phase in several jurisdictions.

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