Conn. Gen. Stat. § 35-11g: Cancellation of registration.

The Secretary of the State shall cancel from the register, in whole or in part, (1) any registration concerning which the Secretary of the State receives a voluntary request for cancellation thereof from the registrant or the assignee of record, accompanied by a recording fee of fifty dollars; (2) all registrations granted under this chapter and not renewed in accordance with the provisions hereof; (3) any registration concerning which a court of competent jurisdiction orders cancellation after finding: (A) That the registered mark has been abandoned; (B) that the registrant is not the owner of the mark; (C) that the registration was granted contrary to the provisions of section 35-11b; (D) that the registration was obtained fraudulently or in bad faith; (E) that the registered mark is so similar, as to be likely to cause confusion or mistake or to deceive, to a mark registered by another person in the United States Patent and Trademark Office prior to the date of first use in Connecticut by the registrant under this chapter, and used in Connecticut and not abandoned, provided, if the registrant proves that the registrant is the owner of concurrent registration of a mark in the United States Patent and Trademark Office covering an area including this state, the registration under this chapter shall not be cancelled for such area of the state; (F) that the registered mark has become the generic name for the goods or services, or a portion thereof, for which it has been registered; or (G) that another person has rights in the state of Connecticut superior to those of the registrant; or (4) any registration concerning which a court of competent jurisdiction orders cancellation on any other ground.