Section 55 – THE PATENTS ACT, 1970

Term of patents of addition

—(1) A patent of addition shall be granted for a term equal to
that of the patent for the main invention, or so much thereof as has not expired, and shall
remain in force during that term or until the previous cesser of the patent for the main
invention and no longer:
Provided that if the patent for the main invention is revoked under this Act, the court,
or, as the case may be, the Controller, on request made to him by the patentee in the
prescribed manner, may order that the patent of addition shall become an independent
patent for the remainder of the term for the patent for the main invention and thereupon
the patent shall continue in force as an independent patent accordingly.
(2) No renewal fees shall be payable in respect of a patent of addition, but, if any such patent
becomes an independent patent under sub-section (1) the same fees shall thereafter be
payable, upon the same dates, as if the patent had been originally granted as an
independent patent.

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