He, and later his estate, never hesitated to take civil action when those rights were violated. Voice actors at the time rarely received screen credits, but Blanc was an exception; by 1944, his contract with Warner Bros. stipulated a credit reading "Voice characterization(s) by Mel Blanc". According to his autobiography, Blanc asked for and received this screen credit from studio boss Leon Schlesinger after he was denied a salary raise. Initially, Blanc's screen credit was limited only to cartoons in which he voiced Bugs Bunny. This changed in March 1945 when the contract was amended to also include a screen credit for cartoons featuring Porky Pig and/or Daffy Duck. This however, excluded any shorts with the two characters made before that amendment occurred, even if they released after the fact (Book Revue and Baby Bottleneck are both examples of this). By the end of 1946, Blanc began receiving a screen credit in any subsequent Warner Bros. cartoon for which he provided voices. Voice work for Hanna-Barbera and others In 1960, after the expiration of his exclusive contract with Warner Bros., Blanc continued working for them, but also began providing voices for the TV cartoons produced by Hanna-Barbera; his roles during this time included Barney Rubble of The Flintstones and Cosmo Spacely of The Jetsons. His other voice roles for Hanna-Barbera included Dino the Dinosaur, Secret Squirrel, Speed Buggy, and Captain Caveman, as well as voices for Wally Gator and The Perils of Penelope Pitstop. Blanc also worked with former "Looney Tunes" director Chuck Jones, who by this time was directing shorts with his own company Sib Tower 12 (later MGM Animation/Visual Arts), doing vocal effects for the Tom and Jerry series from 1963 to 1967. Blanc was the first voice of Toucan Sam in Froot Loops commercials. Blanc reprised some of his Warner Bros. characters when the studio contracted him to make new theatrical cartoons in the mid- to late 1960s. For these, Blanc voiced Daffy Duck and Speedy Gonzales, the characters who received the most frequent use in these shorts (later, newly introduced characters such as Cool Cat and Merlin the Magic Mouse were voiced by Larry Storch). Blanc also continued to voice the "Looney Tunes" for the bridging sequences of The Bugs Bunny Show, as well as in numerous animated advertisements and several compilation features, such as The Bugs Bunny/Road Runner Movie (1979). He also voiced Granny on