Astrazeneca pledges to fight patent ruling

Shares in drugs giant AstraZeneca today fell 4% after an American court ruled patents covering a key heart drug were invalid.

Astrazeneca pledges to fight patent ruling

Shares in drugs giant AstraZeneca today fell 4% after an American court ruled patents covering a key heart drug were invalid.

The court found that patents on Toprol XL – which were due to expire in September 2007 – were “unenforceable” in a case against rival drugmakers.

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