Zesto is a licensed trademark owned by TJ Group Investments, LLC and currently used by a significant amount of independently owned restaurants and independent franchise chains who sublicense the trademark to franchise owners.

Phelan was head of the Taylor Freezer Corp., which in 1945 had developed the "Zest-O-Mat" frozen custard machine, and franchise agreements granted exclusive use of the Zest-O-Mat machines in a given territory under the Zesto name.

[2] The first known Zesto Drive-In was opened in Jefferson City, Missouri, in 1948 at the foot of St. Mary’s Hospital on Missouri Boulevard[3] by its original franchise owner, Lottie Traubtz;[4] dozens more opened in the late 1940s and early 1950s, mostly in the Midwestern states.

Taylor Freezer, reportedly growing frustrated with managing a retail business and dealing with unhappy franchisees, abandoned the Zesto concept in 1955 and left the remaining franchisees to fend for themselves.

The trademark currently belongs to Todd B. Jansa of TJ Group Investments LLC located in Wahoo, Nebraska, who grants exclusive rights to use the Zesto name by territory.