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An ex-employee has taken confidential drawings and designs and applied for a patent that infringes on our companies prior patents. What do I do to stop this?

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I have no idea, but patents do not infringe other patents. Making, selling, importing and using a product are things that can infringe. –  George White Jun 4 at 0:22
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1 Answer 1

In google patents US5842617 for it says

Date    Code    Event   Description
Jan 18, 2011    FP  Expired due to failure to pay maintenance fee

So the patent expired three years ago. They appear to be trying to solve related problems.

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