Questions tagged [us5597520]

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At what point can a patent lawsuit become reality?

Related to this question on 3D Systems patent expiry, it appears that 3D Systems are raising a patent infringement lawsuit on the basis that Kickstarter and Formlabs: knew or should have known ...
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Expiration date of US5597520 [duplicate]

Can 3DSystems sue Formlabs over US Patent 5597520? If it was issued in 1997, wouldn't it have expired in 2007?