The patent office provides due dates for various matters. Some of the due dates can be extended with payment of an extension fee. Responses or payment of maintenance fees can be paid even after all of the extensions have passed upon petition to the Patent Office. There are two types of petitions. (PTO Forms). One is based on an assertion that non-payment or non-response was … [Read more...]
Maintenance fees are due at 3 ½ years, 7 ½ years and 11 ½ years after the date of patent grant. Otherwise, the patent is no longer enforceable against others.
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