The first mass-produced tricorder replica was featured in AMT’s Star Trek Exploration Set in 1974, followed shortly thereafter by a palm-sized version in Remco’s 1975 Star Trek Utility Belt which was sized and marketed to young children in hopes of taking advantage of Star Trek: The Animated Series.

The first life-sized tricorder was produced by Mego Corporation in the 1990s, Star Trek replicas were mass-produced by Playmates, Playing Mantis, and Master Replicas, making commercially produced replicas affordable to the average fan for the first time. In the 2000s, Art Asylum and later Diamond Select produced prop replicas of the original tricorder.

Taken from the Tricorder Wikipedia page.

My attorney Bernie says he’s got it. Trademark it, and then pay whomever – Paramount Pictures, CBS, the Gene Rodenberry estate – insurance, a licensing fee, per unit. Whomever doesn’t want to pay the lawyers either, and so they’ll accept the money, just like they did with all those toy and prop companies, 'cuz they know they could lose in court too.