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Difference between revisions of "Invalid patents remain unchallenged"
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Revision as of 05:27, 13 February 2010
For various reasons, when software patents are considered to be invalid, they're often not proposed for re-examination.
Examples of patents considered invalid but not challenged
- Black Duck's licence compatibility patent
- MPEG video formats - with over 1,000 patents covering these formats, who would bother invalidating one?
- Divine e-commerce patents - the patent holder asked each "violator" to pay less than a challenge would cost
