By Dan Levine SAN FRANCISCO (Reuters) - Intellectual Ventures, a multi-billion-dollar firm that virtually invented a new market for patents and inventions, has curtailed its patent buying in the past few months, according to sources familiar with its patent market activity, as it seeks to raise new funds. Created in 2000, Intellectual Ventures to date has raised about $6 billion and acquired 70,000 patents and other intellectual property assets. The company is currently attempting to raise $3 billion more, according to an investor presentation reviewed by Reuters. ...

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