June 2, 2014
The CAFC's long-standing standard of indefiniteness - that a patent claim was definite unless "insolubly ambiguous" - has been a unreasonable evisiceration of statute. In Nautilus v. Biosig (13-369), the Supreme Court put reason back in.
To tolerate imprecision just short of that rendering a claim 'insolubly ambiguous' would diminish the definiteness requirement's public-notice function and foster the innovation-discouraging 'zone of uncertainty'. A patent is invalid for indefiniteness if its claims, read in light of the patent's specification and prosecution history, fail to inform, with reasonable certainty, those skilled in the art about the scope of the invention. [A] patent must be precise enough to afford clear notice of what is claimed. The standard adopted here mandates clarity, while recognizing that absolute precision is unattainable.
Posted by Patent Hawk at June 2, 2014 4:05 PM | § 112