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What is the time limit for filing Request for Examination? Is there any grace period for filing such request?

April 26, 2017filing grace limit period request time

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What is the time limit for filing Request for Examination? Is there any grace period for filing such request?

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Request for examination as to substance is required to be filed within 42 months for invention applications and 36 months for utility solution applications counted from the earliest priority date. Belated Request for Examination is permissible within 6 months after the termination of the above mentioned time limit with a reasonable reason subject to payment of fee for extension of time for late filing.