In 1984, the vice president of marketing for Mattel Electronics bought the rights to the Intellivision and formed a company called INTV Corp. The company released a console physically identical to the 2609 console on the outside, with remaining 2609 electronics and in some rare cases, disabled Tutorvision electronics. The company also released games leftover from Mattel.
INTV continued to sell Master Components and cartridges, as well as to hire former Mattel Electronics empolyees to continue developing games. Surprisingly, INTV Corporation kept the Intellivision name alive until 1990. Having run out of money, INTV Corporation failed to sucessfully make the jump from exclusively supporting the Intellivision, to developing for the incredibly successful Nintendo Entertainment System, and went bankrupt some time in 1991.
Source Links:
history.blueskyrangers.com
media0101.intvprime.com/ba4ef/intellivision-echo/References-Unsorted/De-Re-Intellivision-pt1.txt