The logo was changed in 1974 to get smoother animation. It was nicknamed "The Rainbow HB".
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The Swirling Star was introduced in 1979 and lasted until 1992. However a touched up version of this logo with the updated text " Hanna-Barbera Cartoons" and a Time Warner byline was used on 1998-2001 episodes of "The Powerpuff Girls". In some variations the Swirling Star swivels while swirling, forming an irregular circle.
In 1985, a new script logo was made.
Hanna-Barbera was absorbed into Warner Bros., though a new script logo (based on the 1961 logo) is being used to promote H-B shows and characters. This logo is only used on merchandise.
Hanna-Barbera is only a production studio, and has never distributed its own shows.