Namco is very involved with Pacman and still involved with arcade equipment based on it. Here's something my friends at Raw Thrills just introduced a little while ago:

https://www.youtube.com/watch?v=koLvoCMHCrI

From what I've heard on the inside, Raw Thrills has been actively working on new Pacman games based on the original 1980 source code given to them by Namco.

TLDR: They definitely still own the trademark and they are still making money on it.