By Mark Savage BBC News entertainment reporter

Hanna and Barbera won seven Oscars and eight Emmys

Characters like Scooby Doo and Fred Flintstone are icons of pop culture and their suspiciously similar catchphrases, Yabba-Dabba-Doo and Scooby-Dooby-Doo, have passed into common parlance.

In their 1960s heyday, Hanna-Barbera were delivering six hours of cartoons and live action programmes to US TV stations every week.

They had a global audience of more than 300 million people, and their shows were translated into more than 20 different languages.

They created a string of utterly memorable comedies Peter Lord, Aardman Animations

Among the studio's most enduring creations were Huckleberry Hound, whose TV show won an Emmy in 1960, and the "effectual, intellectual" Top Cat.

Stone Age hit

Hanna-Barbera was also responsible for Yogi Bear, Hong Kong Phooey, Wacky Races, Captain Caveman, The Jetsons and The Flintstones which, until the Simpsons, was the longest-running animated series to be shown on primetime TV.

The Stone Age sitcom was specifically created for a family audience in 1960, after a survey showed that more than half of Huckleberry Hound's audience were adults.

The Flintstones were originally going to be called the Flagstones

Much of its humour derived from the Stone Age take on 21st century technology.

Notable examples include Fred's car, which was powered by foot, and the family's vacuum cleaner - a baby woolly mammoth who sucked up dirt with his trunk.

It was comedic touches like these that made Hanna-Barbera the standard bearers for animated television.

Cutting costs

"They created a string of utterly memorable comedies," says Peter Lord, co-founder of Aardman Animations, who remembers watching the cartoons as a child.

"It was like a religious experience to see a show that was fast, noisy, modern and - as it seemed to me - incredibly sophisticated."

Yogi Bear's collar made him easier to animate

The duo had realised that, as cinema audiences dwindled, cartoons would find a natural home on television.

But they also knew that TV could never match the $45,000 budgets they had enjoyed when they created Tom and Jerry in the 1940s.

So they pioneered the technique of "planned animation" (also known as limited animation), which featured minimal movement and frequent recycling of backgrounds.

If you look at many of Hanna-Barbera's most popular characters - Fred Flintstone, Yogi Bear and Scooby Doo - you will see that they wear a necktie or have a prominent collar.

Because of what we were doing, the entire business came back to work Joseph Barbera

Industry 'saved'

As a result of cost-cutting measures like these, the company reduced the number of separate drawings required for a seven-minute cartoon from 14,000 to nearly 2,000.

Although aficionados were offended at the loss of meticulously crafted, hand-drawn cartoons, Hanna and Barbera felt they had saved their industry.

"We went into limited animation because there was no money, absolutely no money," wrote Barbera in his autobiography, My Life in Toons.

"And because of what we were doing, the entire business came back to work again."

The technique certainly paid off for him, but few other studios could match the invention and wit of Barbera's characters.

According to legend, the animator would act out his cartoons in the studio, putting on accents and sketching new characters faster than his assistants could pin them up.