Here are some important points to remember :

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The PCT system currently has 2 of 4 international searching authorities and one can be selected depending on the task of the applicant. The following are the International Searching Authorities according to the agreements with the International Bureau of WIPO.




Quality and Reputation of the Authority
The quality and reputation of the ISA can have a significant impact on the outcome of the search and the ultimate success of the patent application. It is important to choose an authority that has a track record of conducting thorough and accurate searches, and is respected within the international patent community. Historically, the EPO has provided a higher rate of positive search reports than KIPO, CNIPA, and USPTO. In addition, it can be expected that EPO examiners will find more relevant prior art and therefore more rejections of claims in the face of rigorous examination.

Technical Expertise
Another important factor to consider is the technical expertise Croatia Phone Number Library of the search authority. The search authority should have expertise in the relevant technological area to provide a comprehensive search report.

Turnaround time
The time it takes for the search authority to provide the ISR can also be a significant factor for applicants. Some search authorities are known to provide faster turnaround times, which can be crucial for those looking to file a patent application quickly. The USPTO offers expedited search options for an additional fee, which can be useful for applicants seeking a faster turnaround time.

Cost
The search fees charged by different searching authorities can vary considerably. Applicants should consider their budget and choose a searching authority that provides good value for money. The Russian IP office is the cheapest and the EPO is the most expensive ISA for small entities, but, for larger entities (i.e. a company with more than 500 employees), the USPTO is the most expensive ISA, as the USPTO is the only ISA in the country. Government fees for a large entity are twice as high as those for a small entity.
ISA options, ranked from highest to lowest cost for small entity applicants, include:

European Patent Office (EPO)
Australian Patent Office (IPAU)
Intellectual Property Office of Singapore (IPOS)
Japan Patent Office (JPO)
Israel Patent Office (ILPO)
U.S. Patent and Trademark Office (USPTO)
Korean Intellectual Property Office (KIPO)
Russian Federal Service for Intellectual Property (Rospatent)
language
The language of the search report should also be taken into account when choosing an international searching authority. The search report will be written in the language of the searching authority, which may not be the applicant's native language. Choosing a searching authority that offers a report in the applicant's preferred language can make it easier to understand and respond to the report.