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It could do this by barring generic manufacturers of the drug from using the distinctive diamond-shaped and blue colour of Viagra and the name Viagra, which are all registrable trademarks in the UK and European Union.

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He envisioned a summer stock theatre that would showcase the talents of.Also, as amply demonstrated by Viagra, drugs patents are often challenged by competitors in courts in expensive and often lengthy litigations that can last the lifetime of the disputed patents.

National health authorities across Europe often initially reject expensive drugs as one form of control.

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The European Patent (UK) 702,555 for Viagra was invalidated by Justice Hugh Laddie in 2000 on grounds that the use of sildenafil citrate - the key ingredient - was already in the public domain before the patent was granted in 1993.Patent Expiration Date For Viagra Canada Proscar Buy Australia Losing 100 Pounds Without Loose Skin Generic Cialis For.One of the biggest concerns for Pfizer in the near future is that the patent for Lipitor will expire.

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But the global popularity and commercial success of the little blue tablets also inevitably provoked the envy of competitors who challenged the validity of their patent.