§21. Filing date and day for taking action
(a)
The Director
may by rule prescribe that
any paper or fee required to be filed in the Patent and Trademark Office
will be considered filed in the Office on the date on which it was
deposited with the United States Postal Service or would have been deposited with the United States Postal Service
but for postal service interruptions or emergencies designated by the Director.
(b)
When the
day, or the last day, for taking any action or paying any fee in the United States Patent and Trademark Office
falls on Saturday, Sunday, or a federal holiday within the District of Columbia, the action
may be taken, or the fee paid, on the next succeeding secular or business day.
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