Conn. Gen. Stat. § 36a-782
Upon payment in full of the balance and other amounts lawfully due under a retail installment contract or installment loan contract by the retail buyer, the holder shall mark the contract and note signed by the retail buyer with the word "paid" or "cancelled" and shall, at the time of payment, return such contract and note or, in lieu thereof, transmit or deliver to the retail buyer a certificate clearly identifying the goods covered by the contract and showing such contract has been paid in full. This requirement shall not apply to any retail installment contract or installment loan contract covering goods for which the cash price is one hundred dollars or less.
Conn. Gen. Stat. § 36a-782
(1949, S. 2865d; 1957, P.A. 361, S. 1 (h).)
See Sec. 42a-9-203 re attachment and enforceability of security interests.