Answer: 3
Why? Opposition procedures, which are in place in many countries, allow public scrutiny of published patent applications or published granted patents for a limited period of time. The Europe patent office gives a 9-month period after the grant of a European patent to oppose the patent on certain grounds. In the United States, there is no opposition procedure. Instead, there is a re-examination procedure where anyone can request the re-examination of a granted patent by the patent office, but only on the grounds of prior art not considered by the examiner during the patenting process.
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